Responses

he tian wrote the note from the jacket. this explanation should help in understanding: http://www.mangago.zone/home/mangatopic/4826478/
and the note isn’t supposed to shed light or any sort of revelation to readers but is more for mo. it’s supposed to show mo that he tian’s feelings for him are sincere.

i also think it's a reference to the beginning when he tian told mo that he didn't want mo to like him? or something along those lines. so it's a call back to that and a confession
So ............................ who wrote that letter? And is it supposed to shed some light to He Tian or Mo's feelings?