Lol, the MC is the one acting childish; instead of talking to your partner about your problem, you use other people to pretend to be ur bf, thinking it would solve the problem, but what happened only added to their problem, causing more understanding between them.
If someone is stalking you, isn't your first reaction was to tell your partner about it? Yet what he did was lie to him and go on like nothing happened, and when his bf happened to see him kissing another guy, he can't accept the fact that his actions have consequences? Why lie instead of telling them the truth?
Of course, he will be pissed off seeing his bf kissing another man because he didn't tell him what was really happening and that he was just using that dude to pretend as his bf.
He must be dumb if he thinks that using other people as their acting bf would make their partner understand it and that he would appreciate it. I bet if the situation is the other way around he would flip at him too.
Jio is being far too unreasonable... you just learned that you boyfriend is being stalked for a long time and you are more pissed off for a kiss in the forhead. I understand that he was also pissed off about not knowing anything at all, but its coming through as if the kiss is the thing he is the most angry about. Also the sister's explanations only makes him look more childish... he is a grown man. He seemed more mature at first but in the end MC is dating another manchild lol im not saying MC is perfect either but in this situation Jio just bothered me so much