Felix and Hwang hyunjin had hated each other since day one. You couldn’t go past school without exchanging a sarcastic remark or a supportive look. Hyunji was the son of one of the richest families in town—confident, arrogant, and used to getting everything he wanted. Felix was his complete opposite. He had no money or influence, and he couldn’t stand Hyunjin’s arrogance. Their arguments were so frequent that his classmates had long since gotten used to them. But one evening, Felix’s world was turned upside down. His mother announced that she was engaged. In a few weeks, they were to move into her fiancé’s house and start a new life as a family. Felix didn’t agree, but he had no choice. When he first entered the luxurious villa and the door opened, he stood frozen. The one person he hated more than anyone else was leaning on the stairs, smiling amusedly. Hwang Hyunjin. "That's not possible..." Hyunjin just smirked. "So you're going to be my new stepbrother? It's going to be a long time living together." From that moment on, there was no escape. School, home... and each other's backs all the time.