Responses
Lover Boy
http://www.mangago.me/read-manga/lover_boy_lezhin/?av=3
I think this is what you are talking about. :D sorry if i'm wrong
beta
Read this a while ago, it's a finished webtoon, the top has blonde hair and the bottom has dark hair and is older. The top has always liked the bottom since he was little, and the bottom now teaches a painting class. The manhwa is mostly in black and white.