It's because Taeyoon would feel like eunhoon used him. After eunhoon's father died he was alone so he wanted a bond or someone whom he could love and not be alone and hence Taeeun. Like he took advantage of Taeyoon's rut
gu yansheng has a really bad judgment towards the people around him! most are false and that just shows how stupid he is go away f u wen niannan deserves better
gu yansheng you trash! people in the manhwa, pls beat him a lot!