Hyun-soo, played by Ryu Seung-ryong, hit a little girl while driving late at night. In a panic, he made a decision that he would regret for the rest of his life and threw the little girl into the lake. Young-jae (played by Jang Dong-gun), the man who lost his daughter, then began to investigate the truth behind his daughter's death and launched a revenge campaign, which involved a seven-year long feud.