It's October 1950, Sergeant Lee and his Eagle regiment successfully attacked and captured North Korea's capital, Pyeongyang. However, the North Korean army has backup soldiers sent from People’s Liberation Army.

Sergeant Lee and his squad are rescued by a guerrilla unit. After running away, Private Chun disguises himself as a North Korean soldier and along the way captures General Park.

Private Chun and General Park are sent to the North Korean Volunteer Army headquarter. When Sergeant Lee is sent to rescue General Park, he finally comes face to face with Captain Lee Sugyeong of the North Korean Army.

General Park and Sergeant Lee's squad escaped from the enemy's headquarter. Meanwhile, Captain Lee Sugyeong gets demoted to Lieutenant.

Private Jung Taek Soo is shot but he is rescued by Sergeant Lee. General Park orders all soldiers to head toward Shinheung camp through the bitter winter forest.

When Lieutenant Lee Sugyeong and her squad finds a group of dead South Korean soldiers, she fears the worst that Sergeant Lee might be dead. However, Sergeant Lee and his squad are actually stuck in a snowy forest.

Sergeant Lee and his squad sets out to Gaema Plateau on a special mission to escort marines smuggling explosives to the enemy camp. However, Private Yang Sanggil delayed the mission when he runs away to see his mother.

The North Korean Army finds the Guerrilla Unit's hideout and everyone in the hideout are killed. Meanwhile, Sergeant Lee and Marine Dae Young are captured by Lieutenant Lee Sugyeong's squad.

Sergeant Lee and Marine Dae Young are being held and questioned by Lieutenant Lee Sugyeong at the supply camp. Meanwhile, his squads are closing in and are entering the enemy supply camp.

In order to save Private Yang Sanggi's life, the squad decides to exchange Private Chun for him. Sergeant Chun Yong Taek gets locked up for letting Private Yang Sanggil get away.

The team finally sets up traps in the enemy's camp. Lieutenant Lee gets caught in the explosion planted by Sergeant Lee's squad.

The squad gets separated from Sergeant Lee and then are caught by the enemy soldiers. They are sent to the North Korean concentration camp.

In order to save the squad, Sergeant Park agrees to become the autonomous squad captian. Meanwhile, Sergeant Lee decides to rescue his team by also placing himself inside the concentration camp.

Sergeant Lee and his squad are still in the concentration camp. They've finally planning to escape during the labor duty.

The prisoners' plan to escape fails. Sergeant Park tells Sergeant Lee that there's a mole among the prisoners.

The squad has a new plan to escape. Sergeant Lee finds out from Agent Yoon Jeongin of the North Korean State Security that Lee Sugyeong is still alive.

Sergeant Lee and his squad are finally safe in a South Korean base. However, they are questioned about their time in the enemy's concerntration camp.

The squad is back on the front-line. Sergeant Park is shot by enemy snipers and Private Beomwoo gets captured.

Private Beomwoo is slained by comrade Woncheol in front of his squad. Sergeant Baek is shot by Lee Sugyeong.