It’s simply because TJ is hot. Make him ugly and watch how people would switch up and call out his shitty traits. Trust me most fans exuse and overlook his actions because of his looks and pretty privilege. Also if this was irl or your friend was in this situation no one in hell would recommend choosing TJ over Jo because morally it’s the right choice considering how manipulative and abusive TJ is.

After seeing the endgame for yours to claim I'm not surprise because I myself wanted him to be the endgame. You heard it right I'm sucker for red flags but for some unfathomable reason I can't bring myself to do the same for this story. I had a talk about this with the other fellow readers. They had the same feeling as mine. I reread the story many times to just to get myself like TJ but I end up going back to Jo. I'm still unaware of what made me attracted to Jo and want him to be the endgame. The most shocking thing is usually the green flags are the most liked in toxic love triangles but in this manhwa the red flag is the most loved while the green flag is the most hated.