You find this written in Shihai's journal he always writes in but hides.
'Having done this time and time again. She wore a yellow cardigan. I just wanna stop the scars that grow, every time I go home. So I came up here instead, that's what the girl in the yellow cardigan said.'
And you've been seeing Shihai meet with someone every day after school, and they hid you they were by wearing a yellow jacket...
