Start with this one
http://www.mangago.me/read-manga/spring_snow_odongtong/
Also
http://www.mangago.me/read-manga/cocoon_of_the_heart/
http://www.mangago.me/read-manga/december_rain/?av=1o
http://www.mangago.me/read-manga/10_years_where_i_loved_you_the_most/
http://www.mangago.me/read-manga/life_senjou_no_bokura/
http://www.mangago.me/read-manga/utakata_no_uroko/
http://www.mangago.me/read-manga/cosmic_boy/
http://www.mangago.me/read-manga/shimanami_tasogare/ !!! beautiful coming of age type of story

Anything super sad that will make me cry? It can have a happy or sad ending but i just wanna read something that will make me feel cause i haven't cried to a manwha in awhile. Doesn't matter the genre