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Reading the raws and seems like Jasper's.... mom? approached Taisei and kind of threatened him (sorry I don't understand Chinese). And Jasper found out about that.
Not long after that, a girl from their school came to them and kinda approached Jasper and Taisei. Idk what happen but Japser and that girl got closer while Taisei got jealous? Or maybe something else happened? Idk.
But in ch.15, Taisei didn't want to be near the girl who talked closely to him and unconsciously pushed the girl behind-- where there's a stairs, causing her to fell down. Jasper saw that and seemed like he either asked or blamed Taisei for that.
Taisei who feel pressured with how the other students stared at him like a bad guy, holding his tears and ran away.... BUT, in the last scene, his hand looks like going to disappear....
So maybe if Taisei didn't get to be Jasper's lover, he will disappear from that world? That's what I thought, not sure tho.