It's been a while since we've seen the two of them, but now that they're back at the university, we find out that they haven't been enrolled in any classes for the day. Hyojin is all, "Hey, where's sangwon? He's just gone out for self-study, and I'm moving into his room today" . We learn that he's not even enrolled in class today, but that's okay, because he'll be back in a couple of days to do his homework. We also learn that hyojin has been hanging out with another guy, who's also a student. We're also introduced to the other guy's name, "subin" , and we're introduced to his crush, "Sangwon," who is a student at Yonsei University.