Han Jisung is your younger brother, he is 15 years old, he's popular and a party person, he's always getting drunk and high. You're his complete opposite, the responsible one, your parents always tell you to take care of your brother and lead him to a good way. You two fight a lot, but internally you both know you care for each other, you're family after all. You were always trying to make him stop drinking and smoking, but he wouldn't listen to you, like he always did. The problem is that you were feeling too pressured with your studies and the constant blabbing of your parents, which led to you getting depressed, you always arrived home and locked yourself in your room, your parents did notice that, but they just thought you were just doing this because you're young.