Darkness Before The Dawn
https://www.mangago.zone/read-manga/darkness_before_the_dawn/
same i cried so bad after it and immediately added Kowloon city to the list of places I wanna visit TT
So glad you liked it <3
as for similar recs, try these :
Love or Hate - most fav istg
https://www.mangago.zone/read-manga/love_or_hate_yeongha/
Double Trap
https://www.mangago.zone/read-manga/double_trap/
A Link Between Relationships
https://www.mangago.zone/read-manga/a_link_between_relationships/
also if you wanna read more such manhwas with good plot plus romance, check out my fav bl manhwas list :
https://www.mangago.zone/home/mangalist/2758080/
any recommendations for psychological bl similar to solo for two manhwa