He Zhaochuan, a retired special forces soldier who disappeared for ten years, returns and enters the underground fighting circuit to raise money for his mother's surgery. He wins the life-saving money with his formidable skills, but ultimately cannot keep his loved ones by his side. On a rainy night, he rescues Shu Wangning from kidnappers. When he rushes her to the hospital, he breaks through a checkpoint and attracts the attention of Tang Lingyi from the public security brigade. After burying his parents, he uncovers the truth about how his family was mistreated in the past and resolves to shoulder his responsibilities and protect his younger sister. Grateful for his daughter's rescue, Shu Zhongting repeatedly invites him to join the company. He Zhaochuan eventually takes a position as an assistant to the general manager, secretly protecting Shu Wangning while safeguarding those around him and gradually investigating the events of the past.