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Nope. Teayoung is a very good friend I would say. And he has nothing to do with the stalker issue. It’s most like the kid who the coach favours. As mc sold his team to the opponent team, it’s most likely he didn’t get to admit into korean uni (as it was a deal between his parents and coach)
So he is harassing and beating mc for revenge
Taeyoung is a manipulative hoe trying to isolate Yesol from everyone else. Possibly likes Yesol. Probably has to do with the stalker issue Yesol's facing.
Clues we got so far.
(Ch2) When his hookup asked to introduce Yesol ----> "No way, he's all mine."
(CH 8) Taeyoung's thought bubbles ---> "I want to enjoy your innocence for along time."
"You don't realize it yet, but you're my prime entertainment."
+ Yesol's mother mentioned that Taeyoung is Yesol's only friend. (Ch7 end notes)
( CH 8 ) the envelops in the mail box. In the earlier chapter, he got the mail for Yesol. But here he didn't. And he showed up without announcing? The death threat spelled out on the floor. There's no way that Taeyoung didn't notice it.