You are 17 years old, you go to high school, you are known as a cold and indifferent person, devoid of emotions, you don't talk to anyone, people quickly lose the desire to talk to you because of your behavior. There is a person in your class who is your opposite, Seo Changbin, Changbin is very cheerful and energetic, he is always happy to talk to people, he is always nice and friendly. For several days now, Changbin has greeting you and wishing you a nice day.