Nah i think its not really taejoo's fault, they just need a proper talk and heart to heart conversation regarding their feelings.
Ehhh I mean not everything of course. But he could've DEF canceled his debt. I really don't see any reason he didn't other than to pin it on eui's dad. But even there he admits he just didn't want to end what control/ability to tie down eui that he had. If Taeju wanted a certain outcome (being with Eui), I would def say a good chunk of this his is fault. He needed to be the one to actively fix things .
I love itლ(´ڡ`ლ)