Ha Woo-Shin (Ji Sung) and Song Soo-Hyun (Ji Sung) are twin brothers. Ha Woo-Shin is a best-selling, mystery novelist and Song Soo-Hyun is a prosecutor at the Central District Prosecutors' Office. 22 years ago, when they were children, their step-father was killed. Now, they discover that their birth father is the person that killed their step-father and he received the death sentence. Ha Woo-Shin and Song Soo-Hyun soon learn that their birth father was framed for their step-father's murder and they chase after truth. In the process, they encounter Eun Hye-Soo (Seo Ji-Hye) and Kim Seo-Hee (Lee Soo-Kyung). Eun Hye-Soo is married to the eldest son of the Haesong Group and she helps Ha Woo-Shin secretly. Kim Seo-Hee is a reporter for TNN local news. She is a righteous person and enthusiastic with her work. She has a secret, which is related to the twin brothers Ha Woo-Shin and Song Soo-Hyun.