Coulton Lee, chairman of the Noah Consortium, appears to be a successful entrepreneur who owns more than a dozen large multinational companies, but his true identity is actually the boss behind the international killer organization "red". One day, he accidentally saved a mysterious young man. After investigation, it was discovered that the boy who was rescued turned out to be Zero, a famous young killer in the police force. Because of Coulton's life-saving grace, Zero agreed to join the red organization to serve Coulton, and quickly showed his super strength, quickly became Coulton's confidant, and entered the leadership of the red organization. But this young man seems to have many unknown secrets. Under his cold appearance, no one can see his true thoughts. But Coulton's son, who returned from studying in the UK, seemed to know Zero and recognized him as the amnesiac boy he had rescued a few years ago.
And what is Zero's true identity? What is the mysterious organization that he really serves? What is his purpose of entering red at all costs and getting close to Coulton?
After all the dust has settled and things have changed, who has been redeemed...