Hello,

I'm searching for Korean movies like 'Sunny', 'Unforgettable', 'Hot Young Bloods'  or 'Architecture 101' that are about 70s 80s or 90s.  Maybe someone knows that kind of movies. I got obsessed while watching 'Reply' series and 'Love Rain'. And I really like watching about old times in Korea, so I'm searching for more movies. If you know, please, let me know!

Off the top of my head: Peppermint Candy and Green Fish.

I'm not sure if they're quite what you're looking for, though, because both are bleak, and they don't have the feel-good vibe of Sunny or Reply series. They do give us a glimpse about how it was like in South Korea in the '70-'90s, and how its political and socioeconomics conditions affect ordinary people's life--badly, in both movies.