One the driven top student and the other a happy-go-lucky troublemaker, Jang-il (Siwan) and Sun-woo (Lee Hyun-woo) become unlikely buddies in high school, both poor but proud in their own ways. Their fathers both have ties to a powerful businessman who orders Jang-il's father to kill Sun-woo's father. One desperate crime begets another, and the boys' friendship derails in a shocking betrayal. The attack leaves Sun-woo blind and in a coma. Thirteen years later, their fates will come to a head when they meet again as adults. Jang-il (Lee Joon-hyuk) has become a prosecutor haunted by his past, while Sun-woo (Uhm Tae-woong), the young CEO of investment trust company Royal Tree, is plotting his revenge. Their fates are intertwined with the women they love?Ji-won (Lee Bo-young), a volunteer reader for visually impaired people who now works as a VIP party planner at a five-star hotel, and Soo-mi (Im Jung-eun), a hyper-realism painter. As Jang-il and Sun-woo vow to destroy each other, the truth unravels in a harrowing cycle of deception and revenge as the crimes and secrets of yesteryear come to light.