Flower of Evil (2020)

Same screenwriter. If you like the family fluff/drama part in Flower of Evil, I think you'll like I Introduce My Father too.

Sakuragi Shun is a salesman who works for a Sunbath Home Housing, a house manufacturing company. He enjoys a happy life at home with his wife and daughter. Due to a sudden personnel change, he was assigned to transfer to Kagoshima, a city he was familiar with from his junior high school days. There, for the first time in 17 years, he is reunited with his first love Takeda Hana. She works as a junior high school teacher, while her husband who works as first mate, spends most of the year at sea, so she usually lives alone. While reminiscing the bittersweet memories of their high school days together, a hidden Pandora's box begins to open...

Furthermore, sparks also fly with Katoyama Naoya, Shun's friend and former love rival from their junior high school days, who now works for another company in the same industry. Although Shun has a beloved wife, the flames of jealousy quietly flare up. Meanwhile, Sakuragi Shun's wife is trying to suppress her anxiety. Based on their phone calls and emails, she becomes suspicious that her husband is cheating on her, and in order to eliminate her fears, she takes a trip to visit him in Kagoshima. As the slight lies begin to pile up, the truth becomes complicated, and when the lies are exposed, how will the relationship between the four of them
change?

He Fei's wife, Li Mu Zi, disappeared mysteriously during their wedding anniversary trip. While he was searching for Mu Zi, she appeared again out of nowhere, but he insists that the strange woman in front of him is not his wife. Lawyer Chen Mai gets involved in this bizarre case, and more mysteries slowly emerge.

Completely different genres as one is based on a crime, one is sci-fi but..
Both romance
Both explores acceptance, embracement and loneliness.
FOE - male is lonely and female comforts
MHL - both lonely and comfort each other
Both have traumas.
Both have a nice and cold guy within one person/face
FOE - male's facade (who he wants to show)
MHL - man and robot (who he wants to be)

Investigations on a mysterious woman Toko started when Sonoe, a teacher and Toko's fellow faculty member, was found dead as a result of what seemed to be an unfortunate accident. Eiki, an insurance investigator, and Takeshi, an ambitious police detective, find links between this case and the deaths of Toko's 3 fiances, and are determined to uncover the truth.

They are both horror/mystery/crime stories and have a similar dark vibe. They both deal with serial killings, even in the Children of Nobody take place in the present. But in both cases the answer is in the heroes'/heroines' past.

Same ML type as in Alice. Both have lack of feeling
or understanding emotions disorder. They don't process emotion
like average people can. Both have a Police officer as Main Lead.

The similarity between these two series is vague but still there. My pov is focused more on the main characters and the relationship that these couple hold.

Both these series have the main couple in love, fighting for themselves and protecting each other from the worst.

The female leads are strong and kick ass. Both have detectives and female leads fighting to protect their loved one.

If you love to see a sweet bond between the main couple with action....this might be for you!

Both male leads have a emotion disorder. Both dramas are about solving crime.
However, Stranger doesn't have romance between ML and FL although they
share a connection it is not a romantic one. Maybe in Stranger 2 they will?

These are heavy hearted dramas and the similiar in ways becuz the ppl in the dramas keep lying that they dont love each other but they love each other very much