It was about a girl finding the reason why her friend died? I saw it in the recommendation but I forgot the title.. It was a very sad one too.
i think: http://www.mangago.me/read-manga/my_broken_mariko/
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Underrated manhwa/hua/ga, its not only sad but yeh: http://www.mangago.me/home/mangalist/782333/ follow for more <3
Shipei is just so well written its gshdjfggg the consistency of this man !!! I LOVE HIM