he’s probably scared that seunghyeon might find his uncle attractive since he’s probably popular. he’s afraid that seunghyeon would see someone who resembles him but has no conditions or looks “more normal”, like seeing someone better than you. the author has already mentioned that chaejun gets jealous easily so it could happen.
the other thing that might happen is that his uncle already informed chaejun that he knows he’s staying with his partner. chaejun is probably not confident that he will be able to introduce seunghyeon to his uncle without his uncle knowing their relationship. his uncle might be homophobic so that’s another factor to consider, which i hope not. if this is the route we’ll going, i hope the reason is that chaejun just doesn't want seunghyeon to become uncomfortable about someone knowing their relationship.
he’s probably scared that seunghyeon might find his uncle attractive since he’s probably popular. he’s afraid that seunghyeon would see someone who resembles him but has no conditions or looks “more normal”, like seeing someone better than you. the author has already mentioned that chaejun gets jealous easily so it could happen.
the other thing that might happen is that his uncle already informed chaejun that he knows he’s staying with his partner. chaejun is probably not confident that he will be able to introduce seunghyeon to his uncle without his uncle knowing their relationship. his uncle might be homophobic so that’s another factor to consider, which i hope not. if this is the route we’ll going, i hope the reason is that chaejun just doesn't want seunghyeon to become uncomfortable about someone knowing their relationship.