NON fluffy rom-coms drama recommendation!!?

i need recommendation of dramas where the leads are mature and deal with situations like adults. i like

 romance but leads acting immature is kind of putting  me off lately. i want to try something new.

hope u can give me some recommendations!

Thanks in advance!!     :)

One Spring Night

Just Between Lovers

Chocolate

Summer Scent

thanks for ur suggestions everyone! i will give them a shot :)

Piece of your mind - Don't mind the low ratings, just let your empty broken soul enjoy this warm soulful drama.