Flower of Evil (2020)

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.

Although Baek Hee Sung is hiding a dark secret surrounding his true identity, he has established a happy family life and a successful career. He is a loving husband and doting father to his young daughter. But his perfect façade begins to crumble when his wife, Cha Ji Won, a homicide detective, begins investigating a string of serial murders from 15 years ago. Ji Won notices changes in Hee Sung’s behavior and begins to wonder if he could possibly be hiding something from her.

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?

both plots envolve kidnapping, murder, mistery, a child, a loving mother willing to do anything to protect the family...

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