Recommendations

Both story deal with two too-close friends and their own love story.
Their Personal Professional life and wedding.

Both have a robot as a lead.

A story of popular idol Hu Li, who discovers his true identity as an AI and his company is planning to destroyed him in the form of "suicide by depression" due to an irreparable malfunction. Hu Li then escapes to Ji Nian's house, and begins a fantastical and romantic life of living together.

Also has a robot theme.
As the chairman of a successful technology company, Lu Sen often finds himself in large group settings. While he has no problem addressing any number of people, he has incredible difficulty with any sort of direct, physical contact. Suffering from a strange allergy which is only triggered by direct skin-to-skin contact, something as simple as a handshake could prove deadly. Without the ability to directly come into contact with others, Lu Sen is intrigued when he learns a doctor by the name of Fu Yang has created an incredibly lifelike robot companion dubbed “Friday”. Willing to invest further in Dr. Fu Yang’s work, Lu Sen has requested Friday be delivered to his home so he can test out the full capabilities of this incredible creation. Though agreeing to Lu Sen’s request, the doctor is mortified when a last-minute technical issue renders his robot useless. Unable to bear the thought of losing both his credibility and his funding, he asks his former assistant, Yang Shan Shan, to take the robot’s place, just long enough for him to get it up and to run again. Being the real-life model for the robot’s looks, Shan Shan is identical to the robot in every way and only agrees to the doctor’s request when she realizes she really has no other choice. Arriving at Lu Sen’s home on “Friday”, Shan Shan does her best to emulate the robot’s behavior...

A teen in both is being raised by a killer/group of killers. It affects their relationship. In Kill Bok Soon a teen doesn't know about them being a killer, In Hwayi: A monster Boy a teen knows and is being raised to be a killer too.

Happiness isn't about high school students but adults however these two dramas are similar. In both normal people are put in the grave situation one day and have to fight for their lifes.

Both are adapted from a Webtoon
both have 4 main leads as heroes
Good bonding between the leads
Thriller
both are supernatural
Both are from OCN and Netflix
Amazing cast!
Both have an amazing story line and they're addicted to watch

Male Lead has same trauma & female lead acts as robot..

Kim Min Kyu is the largest shareholder of a financial company. He suffers from a "human allergy", preventing him from normal interactions with other people. He becomes interested in a robotic project named Aji-3 created by the Santa Maria robotic team. The team is headed by Hong Baek Gyun, inventor of Aji-3 and world-renowned robotics professor. He modeled Aji-3 after his ex-girlfriend, Jo Ji Ah, a struggling inventor that also works as a personal shopper to make ends meet.

Just when Kim Min Kyu wants to test the robot, an accident causes the malfunction of the robot's battery. Hong Baek Gyun begs Jo Ji Ah to take the place of Aji-3 and pretend to be the robot so they can get funding from Kim Min Kyu. But, Aji-3 becomes the closest thing that the lonely Min Kyu has to real contact with another person.

Both FLs are food bloggers/critics and MLs are talented at cooking/baking. Both are simple, sweet romances.

The same actors who play the second leads of SIMU are paired up as the main leads of EAT, so if you liked them in one, you'd enjoy seeing them in the other.

Got similar vibe. Though Run On is more slow and got more into comedy.
Sweet teeth is more sweet and cute.
Both dramas got very good chemistry between all pairs in drama.

The vibe of both dramas is pretty similar. They are both really relaxing, yet intriguing. I really liked the natural and calm vibe of “Crush”. Got the same feelings watching “The Science of Falling in Love”.

Both Dramas have:
- a grown-up, competent and very likeable female lead changing her life
- cute and healthy romance without the typical tropes, but still squeal-worthy
- a positive. can-do vibe that makes you feel good after every episode

If you need a Drama to lift you up and give you a happy mood - both of them are great!

**POSSIBLE SPOILER** Bed Friend reminded me of TWM: The Next Chapter because they both involve supervisors who make inappropriate sexual advances towards one of the leads, who is their underling, thus causing jealousy and conflict from the other lead.

MY is a small town in summer, where the FL finds comfort and healing in a group of locals.
WN is a small town in winter, where the FL re-connects with her family and neighborhood friends.

Both dramas have a cozy vibe and in both dramas a restaurant/café brings together a group of people and they start to build a life together although they don't plan on staying forever.

WN has a time travel element but only in the first and last episode.

In both female leads are food or desert blogger. Both dramas related with desserts and sweets . Both are simple but very sweet and fluffy story. Even most importantly in both drama there is a second lead couple who are more mature than the main couple. Actually in both dramas main couple are sweeter comparing the second lead couples. Very much similar vibe . If you like one of them don't miss another. "Drunken in Good taste " is quite shorter than "Since I met U ".