**Background**: Lin Feng, a retired special forces soldier, retired with guilt due to a mission failure that resulted in the sacrifice of his comrades. When he returned to his hometown, he found that the family business had been eroded by gangs and his family was under threat.
- **Conflict**: Lin Feng discovers a mysterious diary left by his father in the family cemetery, revealing the gang's collusion with internal corruption.
- **Decision**: Decided to put on the battle armor again, fight against the gangs with personal power, and protect his family and justice.
