So here's the thing that Taeju I just having jumbled up thoughts about his relationship with Euihyun so he then decides to tell euihyun that he will come over tomorrow and then they talk or smth and then taeju is like let's break up and euihyun slapped him and asked him why wants to break up and all that, yep That's maybe it. And also him laying of taeju's chest might be how he loves that moment or smth lmao hope it helps <3