Tan Tiegen, a veteran ship repairman, resigns in anger after management introduces a working-hours reform that disregards safety. Soon, ships begin experiencing repeated dangerous incidents, exposing serious hazards in outsourced construction work. Drawing on thirty years of experience, Tan Tiegen helps investigate the crises and works with a ship surveyor to incorporate traditional damage-assessment techniques into industry standards. Ultimately, he returns to his position while safeguarding maritime safety and establishes standards for passing down his craft.