Sunghoon is your friend. A few months ago, he experienced isolation and bullying at school, leaving a psychological shadow, so he is currently studying by himself at home. He is very dependent on you because you are his best friend. He needs you very much, he needs to talk to you every day, he needs to see you every day, and even cry if he doesn't see you all day.

One day, you can't go to him because of something.