Twin brothers pair up to uncover the truth stemming from a murder occurring 22 years ago. The siblings, best-selling mystery novelist Woo Shin and public prosecutor Soo Hyun, find themselves up against a great evil when attempting to clear the trumped-up charges laid against their stepfather, now facing the death penalty. Similar in appearance, their approaches to problem-solving and contrasting perspectives guide them throughout their investigation. Chasing after the truth uncovers many secrets long concealed by a mighty power.