2busywatching

First, they learned later that she donated a kidney. Then, after learning that the detective said to be Sarah is alive, the public notice was supposed to go out, but she showed up during/before that. She gave her DNA, knowing that will proved nothing, and then when they could not prove that the person with 2 kidneys was not Sarah, because the tissue sample was missing.

Also, both Sarah Kim and Kim Mi Jeong are people with no background data about them. If Mok Ga Hee were Sarah Kim, she would have been dead 5 years ago [but they said that Mok GaHee is also one of her aliases], so we have no documentation of her. Similarly, Mi Jeong ran away from her home at a young age, and they also have no documentation of her, because they checked for her identity and couldn't find anything about the dead person, i.e., why the dead body remained Jane Doe for so long.

Edit:
I looked up the law, so I know that an autopsy requires family approval or a prosecutor’s request, but for a few days, the identification of the body was done as Sarah Kim, but still, why? Here is what it said: [I'm copy-pasting this]

"If the body was already processed and identified under an assumed identity, and there wasn’t an immediate strong suspicion, they may not have had automatic grounds to reopen and re-examine it right away. Police need procedural justification."

That is the point, time after time they were unable to prove her identity, because they have no documented evidence, that's why they were unable to process her [the Sarah Kim sitting in lock up] and get the arrest warrant issued from the court.

Also, the fact that the entire kidney donation was secret, they only came to know after meeting the said husband [who is a loan shark], do you think he would have documented this suspicious organ donation? And let's say even if he did, the police again needed the documented evidence, transplant records, verified medical documentation [not just forensic findings that deducted the dead person is not not sarah kim cause she had both kidney the verified medical documentation is solid proof of that deduction], and then accessing transplant records involves privacy laws and court approval.

And [again copy pasting here] "Organ transplant databases in South Korea are tightly regulated. A judge would require a clear explanation of why those records are directly material to the criminal case."

And they have none cause they have no way of proving her identity. Also, the arrest was an emergency arrest, which put them on a tight clock to get the warrant approved as soon as possible.

I think a Korean person has a better understanding of this or can give a better reasoning than I can. But to me - His character is of a classic rookie from a rich family who was interested in working under him, and he did. He went ahead with what he found suspicious because he wanted to prove that he could be helpful. But in all honesty, his dad is an assemblyman and pretty much proud of him as it seems. He is in the national police force just for exposure because honestly, he has a much higher social hierarchy than the detective/chief there

I don't think she had eyes inside the station but when NOX was under investigation she figured her brand will be under fire too because the investment money was not the ceo money but company's investment fund, that why she got so angry when she learnt that the 15 million won was not her [Nox's CEO] So she showed up cause all the stuff that prove anything about her was not punishable by law and what was punishable the police have no solid evidence. So she was blatantly confident. The money she got was from her loan shark husband the pine tree was inside the store she didn't sell it, I have no idea how that pine tree is alive but the initial 500 million won she had was cause of her husband cause after that we see her going shopping continuously as suggested to built her class or to build what we want other to know her by.

The detective lacked originality agree with you to the fullest. I guess it was there cause for the rest, they have no solid proof, no record or identity or background info on her or the dead body, so they were trying to pin anything on her, but yes it was questionable cause I guess the marketing and branding stuff is like now became just a commom knowledge that it makes the detective so incompetent with her questioning

That’s what we know after the hospital visit. Her initial plan to approach Ji Hwon was to make him sufficiently agitated that he could kill the person who was hurting her, and as a martyr, she would save her husband. By doing so, she would have injured the organ, but the plan failed when the attack was not serious, but she did win over his trust, not only by taking the knife on his behalf but also by mumbling, “Is your kidney safe?" because he said to the detective that even after walking up, she was worried about me, making him emotionally invest in her.
Right after that, they talked out his funeral arrangements and the fact that she would receive everything after his death. After that, when he was weak and in the hospital, all she had to do was run away, [as she was going to give him her kidney, which was the only reason their marriage was not a known fact to other so if she ran away, none of his men would go after her]
But when she came out of the hospital room, the old area boss who loaned the money saw her and recognized her, and told the real truth to the boss. So when she was running, as they said, the time I learned she must be already packing to leave, she was caught.

By the 7th episode, we learn Kim Mi Jeong’s obsession with Sarah Kim and her lifestyle.
It would have been made up, or a lie, but then the department store CEO confirms the narrative that there was this crazy person who was going on as Sarah Kim, causing a ruckus. But Sarah didn't report her. Why? If she did, all her lies would have unravelled as well. So she endured it. Then Mi Jeong learned that what she created was going for millions of won in the market, and she got greedy. When Sarah said she was pathetic, she[Mi Jeong] decided to properly blackmail her, and this is the reason Sarah lost it when she saw her wearing the same fit and everything else being a complete copy of an identity she created. They fought, and Mi Jeong ended up passing away[not in terms of dying] because of head trauma. She decided to kill her to keep her identity as Sarah safe. Because, like her, there is no info on Kim Mi Jeong that why the dead body was Jane Doe for so long.

Also, she disfigured her and went MIA. That's her pattern whenever she hits low in her life, she kills the identity she was wearing, then comes back and spend big amount of money.
She came back as Sarah because of her brand their was going to be an investigation into it being a scam, and she was sure that they[police] had no proof to prove what they were claiming about her not being Sarah Kim

For some reason, I thought that at the end of episode 7, it would turn into a classic tale of who is the real person?
"When the fake looks like real, can you even tell which one is fake?" echoed the same vibe from thriller kdarma THE FROG "if a tree fells in a deep forest, will anyone hear it fall?" [That saying was the basis of that thriller]
From the beginning, the distinction between real and fake was present, so when she said she killed Sarah Kim, I thought her name was Kim Mi Jeong. I gasped because the entire drama replayed before my eyes, and I realized that the people who knew Sarah would never betray her because they would want her dead, and then being alive and a scammer. There were no images; we viewers only saw how she looked, not the police or anyone else. So, what if that’s the truth? Then, episode 8 happened, and we saw her face clearly twice on camera, and everything else. I’m not saying either is better; it’s just that both are okay.

The first 4 episodes, where we explore all her different aliases, are quite interesting to me, even though a few scenes were the same but told through different perspectives. It truly shows how we, as human beings, perceive different identities of the same person and how differently we treat each one. None of them outright wishes she were dead, but they should express their resentment toward her different identity.
One sees her as ambitious and threatening. Another sees her as fragile and dependent.
Another sees her as manipulative. Another sees her as inspirational but unsettling.
What’s fascinating is this: each perception reveals more about them than about her.
Their insecurity, their envy, their fear.

Also, if anyone has watched the movie The Chaser, in that movie, by the 40-ish minute mark in the 2:30-hour-long movie, the perpetrator is sitting in front of the police and, in less than 5 minutes, confesses his crime. And that is when the killer exploits investigative incompetence and time pressure.
Here, Sarah is sitting in front of the detective, and she came forward herself, halfway through the show, ready to exploit identity confusion, legal boundaries, and lack of concrete proof. As the real issue is that they have no proof, not for The Jane Doe or for The Sarah Kim sitting alive in front of them.

And honestly, in those moments, I wanted her to get away with this, but then I realized she brutally killed a person. This also made me realise how I, as a viewer, perceived her.

Binged this in one sitting. A few things;
The first few episodes reminded me of the Only Murder in the Building S1 screenplay.

im not korean but on this point " If she got away after the 48 hours, it’d be hard to get warrant arrest again unless they’ve solid evidence to arrest her." in the drama said that she can't be arrested for the same criminal act if they failed to get arrest warrant within 48 hours.

She is Sarah Kim. She chose to kill Sarah Kim so that her brand [the creation she made] stays alive. If Kim Mi Jeong were the dead girl, Sarah Kim was a murderer, and the brand was a scam. But if Sarah Kim were dead, then a crazy impostor killed a businesswoman, and all the inquiry over her brand will be suspended because of low prosecutive evidence. So she let go of her Sarah Kim identity, used the dead victim's identity, and became Kim Mi Jeong.

Absolutely not. Remember their talk about their philosophy? That’s where the reason lies.
He is a loan shark boss, and she was once indebted to him when she worked as a staff member at the department store. She saw him as transactional, predatory, and incapable of true mercy: the classic identification of loan sharks. So when she approached him, she was set on the fact that she was not going to give up her kidney.

Now circle back to their actual conversation. He said that once he gave enough money to a person who was the CEO of a failing company, and the amount was so large that he couldn't have repaid it in his lifetime, so when he died, it was up to his son to pay it back. But when the son gifted him that pine tree, he showed his first-ever kindness to someone.
But her philosophy was that "if you promise someone salvation and then withdraw it, that is the most exquisite form of punishment." And this story of his broke her view of him, and she realized he is capable of discretionary grace.

Now the most important part: when she was captured by his men, he ordered them to let her go. This broke the power dynamic because up till now she had made him depend on her, believe her, and emotionally invest in her [the same trick she did when the department store CEO left her phone to record in her store, she knowingly defended her].
So the power dynamic became that he could have destroyed her, but again showed the grace that created this psychological debt in her mind. In this way, he became her savior without denying her the salvation completely, going against her philosophy. So to regain her agency, or, we can say, pay away her psychological debt, she donated her kidney, again changing the power dynamic.
He saved her once she saved him permanently.
Doing this, they became even. It wasn't gratitude, because if it were, she would give the kidney and walk away clean. But she took the pine tree with her, removing the symbol of his kindness.

Seems pretty interesting to me,

Truly agree with you

I watched it because of that reel showing the man about to jump off the bridge, and I'm so happy I decided to watch it. For me, it’s 10. It’s a movie I can rewatch again and again. Very heartwarming and funny. It kinda had a good balance.

Yes and that fact that she only came back to sell the property so a resort can be constructed then through which she will be benefiting the money and not to see her child like for once she didn’t made a single attempt to see her child and now she is gaslighting that the uncle didn’t allowed her to visit.

Wow, there were few comments where people said she was not wearing gloves that why i made this comment and since the drama is fresh my other comments are not visible anymore except this one. My other comments do mirror what you said in first three line. But then you maybe more frustrated than me to address this as bi*ching

Throughout the movie promo, they brought the doll, and I thought this was because Cha Eun Woo is in the military, so he can’t be there, and since this is a comedy movie, they chose the quirkiest way to promote, but dude, nowhere in the description did they warn me about this.

Yes that is what should have happened but till the end the writer omitted any single scene that could hint to this that' how it becomes as weak writing job

Yeah it like in the glory the pink lighter was never sent to forensic department cause they thought it belonged to Soo hee but what made the difference there was the fact writer showed why this happened, the bribe mother gave to the police who covered the case and rushed it to declare it a suicide but here, till ep 11 I thought the dad for sure will be revealed as a person who is involved cause he seems to know his daughter whereabouts all the time maybe that's why he will going to be aware of the crime she committed and reached out to chief prosecutor before the proper investigation was started but in ep 12 there is NO info on this

thank you for your comment I'm deciding not to read the comment section throughout the entirety of this drama cause I just started and I'm liking it so I don't want to spoil my mood

Honestly, that cleaning scene is bad. There must be evidence everywhere, even if not the fingerprint, but definitely hair, skin, and DNA

But many kdrama utter that during rain, evidence gets tempered, and it will not be the first kdrama where police did a lousy investigation. But still, the writing could have been better

And to people who did see the gloves, this is for you. When the person grabs the phone, they are wearing gloves, which are somewhat invisible because of the color grading they did in that scene. I can look up the time stamp.

Edit: ep-11, at 42:14 (look at the hand, there is no gloves), but at 45:08 (when they begin cleaning there are gloves), then after washing the hand, and they came back out with gloves at 46:03, it get more clear at 46:10, 46:21, 46:26, 46:35, 47:06, 47:09, 47:11, 48:10-13 (it's a quick shot)