Ikr but chill, babygirl. Let this cook until December.
While I agree that he should confront the douchebag, Yj just can't trust anything the siblings would say. Douchebag has a habit of changing subjects or just straight up ignoring stuff. Meanwhile his sister is shady bc yj knows that she is trying to make douchebag sound better than he is.
And after the chapter where he might have/might have not yelled at douchebag, which he believes truly happened even if it didn't, he can't trust in douchebag to not gaslight him again. Ultimately, I think yj is just not in a good mental state at all and feeling so unsure is not making things better since he already knows douchebag is hiding smt. Although yj loves douchebag, his kid is more important and he might run away with his kid and give douchebag a bigger reality check bc of it.
i really do hope he and the kid runs away and dissappears for a few years. hopefully he has found someone much better and found a way to help the kid with his health in the mean time. i also wish there was a way for him to break that bond thing. and to make that asshole suffer forever
STOP BEING A SILENT IDIOT! TELL HIM WHAT HAPPEND! SCREAM AT HIM DEMAND HIM TO FUCKING ANSWER AND TELL YOU THE TRUTH FOR GODNESS SAKE. what i hate most is when charactars always have to play "the silent, don´t speak up, nothing is wrong" card. just fucking say it. be angry with him you have the fucking right to be both scared but also angry. you should have called both siblings over right away telling them what happend! if he had been real i would have gone to him and snapped his neck, he makes me so mad right now.