Chen Xiao, an orphan suffering from late-stage kidney cancer, unexpectedly binds to a life-extension system that rewards him with additional survival time for confronting injustice and standing up for what is right. Once accustomed to silently enduring everything, he refuses to keep compromising and bravely fights back against unreasonable harassment on a bus, recovers unpaid wages, and defends his legal rights. He later stands by his principles, protects the vulnerable children in his orphanage, and exposes an illegal conspiracy. As he continues to uphold justice, he unexpectedly uncovers the mystery of his own origins. Despite suffering from multiple serious illnesses, Chen Xiao retains his kindness and stands firm on his principles and moral boundaries. With his limited remaining lifespan, he bravely protects those around him, transforms himself, and searches for a new life of his own.