Lee Soo Hyun is adopted into Kang Min Ki's family because his parent's were murdered by gang memebers. They both grew up to become NIS agents, brothers, and best friends. Suh Ji Woo and Soo Hyun, who knew each other from childhood, are accidentally reunited when the beautiful Ji Woo caught the attention of playboy Kang Min Ki. She and Soo Hyun are separated once again because of Soo Hyun's vengeance against his parent's enemies.