It's because Eunsan is scared of letting himself go that he doesn't want to face Ian's feelings. He might be even more into him in future than he expected. Sweet.
He never really wanted to be emperor, and he genuinely loves his sister, so much that he will take the emperor position so she can live a comfortable life without the weight of the crown, he is a good person and a good brother, I wish that he can get a happy ending in this life
It's because Eunsan is scared of letting himself go that he doesn't want to face Ian's feelings. He might be even more into him in future than he expected. Sweet.