It's been 5 years since I've read that manhwa and I'm so desperate to look for it because I want to recommend it to someone.
As far as I can remember, the cover of the manhwa is blue, then the plot was about the uke moving on from his deceased partner and the seme trying to help him move on while he's so depressed TT
The story was like there was this girl who's very disturbed because of the unusual noises of her neighbor. Then one time she secretly barged in her neighbor's house and found his university id and he's a med student (?). Then later on the girl and her mother fought so the girl ran away from home then the neighbor gave her an umbrella but she followed him home soaking wet and she slept (literally) at her neighbor's unit then the next day her mother found out and thought their neighbor was her boyfriend. Ah, the neighbor has a child and idk if it's his legitimate child or adopted but that kid was kidnapped and the girl (the neighbor) saved the kid from being kidnapped (=・ω・=)
AAAAAAAA here we go again with cliff hangers T__T