Oh Sehun, a 17 year old boy who have everyone's eyes on him. He's known as the most richest kid in school as his parents own 6 hotels in Seoul. A rebellious, arrogant and playful kid. One day, a Chinese boy got transferred at his school, in the same class as him. The moment when the boy entered the class, Sehun was mad at him but he just can't take his eyes off of him. It also turned out that he's sitting next to Sehun in the class. Sehun wants to be his friend, 'bestfriend'. Sehun's bestfriends, Kai, Suho, Chanyeol and himself has made a bet of.....