Recommend any sad manga/ manhwa. Doesn’t matter if it’s bl, straight or gl(〃ω〃)

10 years where I loved you the most
Let's cry together

Witch of mine,
Back in time to you
July found by chance

http://www.mangago.me/read-manga/i_will_be_waiting_for_you_in_1999/

oof witch of mine rlly killed my heart