I understood this chapter as taejun at first suspecting that geonwu had feelings for him, but after seeing geonwu make 0 moves on him even though he was dating a lot during hs he stopped suspecting geonwu of crushing on him. I'm not saying hes not trashy, but he's not as bad as the comments make him out to be. taejun clearly has feelings for geonwu as well, he's just a dense idiot and hasn't realized it yet