I know. This drama takes less than a day to finish, but I enjoyed it! I completely disagree with those who say all the angst wasn't realistic. There were so many layers to this plot, and it was so well written!
Jiwoo went back to his hometown, hoping Seojoon would follow because Seojoon said that if Jiwoo was having a hard time he would go to him. Jiwoo felt lonely, probably a little unwanted, and it's mentioned that his self-esteem is low. Seojoon is likeable and funny, he's good with people and popular. Jiwoo saw that and felt like he wasn't good enough and that all his feelings about Seojoon - "Don't have frequent calls with others and don't laugh. I'm the jealous type. I won't let you do it. All this time, you acted like it was nothing. I've been holding it in all this time. Had I said it, I was afraid it would affect your job." - this would damage their relationship. Since Seojoon would clearly do anything for him, Jiwoo knew that if he could say how he was feeling, Seojoon would stop taking roles and stop appearing on shows which would be horrible! Seojoon is a great actor and Jiwoo didn't want to take that away from him. Jiwoo felt like the problem, so instead of talking to Seojoon, which we see in a flashback is difficult for him to do even about simple manners, Jiwoo left.
I adored all their cute and romantic scenes! These actors once again delivered! I would highly recommend watching it if you liked season one!