Flower of Evil (2020)

The background is a detective story plus thriller, the MCs are kind of cold and unapproachable by most people, they both deal with an almost Impostor's Syndrome situation over and over again (except they don't doubt themselves, just don't fit in, for reasons).

There's quite a bit of similarity between the endings of the two dramas, too (can't tell more in order not to spoil them.)

Also, the acting is through the roof - you've seen the male leads together (Lee Joon Gi and Jung Kyung Ho) in another rather good drama, Time Between Dog and Wolf, and they nailed it there, too.

Main character also uses someone else identity due to complicated family issues.
She then falls in love and starts a relationship while hiding her true identity.
Mask is more about the lies and betrayal between the couple, their relationship is more complicated and not as stable as in Flower of Evil.

die serie ist änlich . er gibt vor jemand zu sein was er nicht ist und spielt gut . bisschen zeitreise is dabei das hat mich gestört aber sonst recht cool

SIMILARITIES
• Both follow a married couple with a child (both are daughters)
• Both couples both struggle with their relationship at one point
• Someone in the family is kidnapped (/held hostage) at some point
• The stakes are pretty high in both dramas - you will feel tense watching both dramas
• Both are mystery and thriller - crimes that take place in present time are related to characters' past, so there's multiple mysteries to an extent

DIFFERENCES
• Flower of Evil follows a morally grey character ML who has been through a lot but still wants to do everything he can to protect his family. Whereas in My Family, the ML is basically an absent father who doesn't pay attention to his wife or daughter.

Both have the same general plot and similar scenes, with the M L hiding his past from the FL who is his wife and in law enforcement, as all the while she begins to suspect him of being a murderer. SOY shifts the setting to ancient China, while FOE is modern day South Korea.

Both shows make me experience similar suspense, angst and thrilling moments. Both are fast-paced in terms of dropping clues and relations among different characters, building a great momentum in each episode to keep me curious on what's next.

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.

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.

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.