Synopsis：Ten years ago, the former wolf king Rex rescued a young boy who was on the verge of starving to death and took good care of him to help him recover. Ten years later, in order to eradicate the brutal leader who ruled the gang, Rex hid his true identity, infiltrated the dangerous gang organization, and prepared to launch an act of revenge. However, when he finally got close to his target, he was shocked to find that the new leader who now controlled the entire gang was the boy he saved with his own hands! The boy who needed protection in the past has now grown into a powerful man.