trying to find a comic,,

i'm pretty sure it's a bl manhwa, but there's this side couple with a guy with red hair (i think?) and an older guy.

the guy with red hair (?) leaves (?) and promises to come back (?) and be better, and when they reunite he says something along the lines of “everything i did [to be come more mature] suddenly disappeared after i see you again”

tbh i dont remember anything much else about the plot or the main couple, although i think the older dude owned an establishment like a café or a bar or something

thank you in advance to whoever might be able to find it !! been thinking abt this for a long time and going through my read lists but there's too much to check ╥﹏╥