Kumaxell

Both dramas have the same premise. The protagonists never met their fathers and have strained relationship with their mothers. Mysterious force sent them back to a time before their birth when they would meet their younger moms and become friends with them.

Both dramas deal with subject of social outcasts and how they came to feel that suicide was their option.

Same concept. A bureau that specifically handles the relationship between humans and monsters and a newbie who is different from his coworkers.

Both story started with a friend steal the kind, naive female lead's man. FL then took revenge against the fake friend by stealing the woman's son.

Both dramas are about a group of strangers who was gathered together by a mysterious person to complete a mission(s), in which their lives are depended on their team work. Later, they discover they are not randomly selected but carefully picked because of their association.

Both drama depicts a side characters of manga gaining self awareness. Her attempt to change her story also inadvertently changed the story flow of main characters of manga.

They have the same comedic style, which is they don't take themselves seriously. They are shows you can easily binge watch.

Both drama depicted a female pretending to be a guy in all male environment. The female lead is very good at making viewers naturally accept her as one of the boys, and not a tomboy pretending to be a real boy.

Both dramas depicted women at a crossroad in their lives or feeling lost in their daily existence. A mysterious young man entered their lives and offered them understanding and intimacy. His brief companionship encouraged the women to face whatever difficulties they might have.

An immortal female lead who feels jaded toward death. A male lead who reignites her passion for life and may be connected to her past.

Both are comedy that show monsters living in the city and the bureau that oversees them. The bureau's mission is to keep the existence of monsters a secret from the human.

Both dramas explore the complex relationships within extended families and the strict hierarchy between prestigious families. The shows' slow pace enables them to build well fleshed out characters.