The movie focuses on the battle of Cheolwon, where the 63rd Army of the Chinese People's Volunteer Army (CPVA) was ordered to enter the battlefield of Cheolwon in May 1951, just after a month-long battle, to fight against four divisions of the United Nations Army (UNA). The volunteers fought with bloodshed and finally brought the enemy to the negotiation table.
An accidental death of the suspect leads to the entire team of the Third Division being imprisoned. Six years later, team leader Cheng Bing is released but remains consumed by the case. Over the next eleven years, he lives a normal life while secretly tracking down the killer, determined to see justice served.