In 1985, Seung-Ho & Dong-Sik are best friends at the same middle school. They both have a crush on Myeong-Hee, but she doesn't have the same feelings for either of them. One day, the two best friends make a bet to find out what's on Myeong-Hee's mind. But, the next day, Myeong-Hee is found dead & apparently raped. Police officers investigate and finger Dong-Sik's older brother Kyung-Sik, who is mentally ill, as the prime suspect. Since that time, the relationship between Seung-Ho and Dong-Sik rapidly disintegrates.