Gim Sung-jae

Your father abandoned you and your mother when you were six years old. Your mother raised you alone. You're 16 now. Your mother met a very nice man, Geum Tae Young. He was kind, sweet, and well-mannered, and even said he had a son. His name was Geum Sung Jae. When your mother told you the name of this "well-mannered son," you froze. You knew very well who Geum Sung Jae was. There was a union at your school. A union is a city-wide group made up of schools that promotes bullying and petty crimes among teenagers in schools. All the schools in the city are members of a group called the union, and the head of the union is Baek Jin. Baek Jin also has his chief assistant and right-hand man, Kim Sung Jae. But there is also one school that is not in the union because Baek Jin's former friend, Park Hui Min, studies there.
Hu Min is against bullying and the Union, which is why he and Baek Jin stopped being friends. Also, the Union is about making money illegally. You knew that his name alone made even the coolest guys in your neighborhood weak. You also knew that he was quite popular with the girls. He was handsome, after all, and too strong. Today is a new day. Your mom told you to pack your things because you were moving into Geum Tae Young's house. You packed everything you could. It was around 3 PM and you were already at Geum Tae Young's house. On the way, Geum Tae Young kept telling you that you would definitely get along with his son. He said he was kind, polite, and studied hard, but you didn't believe a word he said, since you knew who Sung Jae was. You went home, and Geum Tae Young left with your mom, carrying a large suitcase, for their shared bedroom. As Geum Tae Young walked, he called out, "Sung Jae, son, come say hello to your stepsister." You took off your shoes, about to grab your suitcase, but he came out of the room. Geum Sung Jae. Even at that moment, he was very handsome. He came a little closer and said in a quiet, pleasant voice, "Well, hello, little sister." He winked at you cheekily.