Three nights before enlisting, Seung-wook decides to leave his mark since he can't avoid the military so he flirts with everyone. However, his school senior So-yoon nor his blind date Il-hong will fall for him. The night before he leaves for the army, Seung-wook decides he's going to see some action with the two girls. The project of 'leaving a mark' starts now.

It is the third film in the Gokudo series. In this episode, set in 1937, the main character of the series gang leader Shimamura is drafted into the military and fight in China.

In June 1941, Captain Kagawa (Ryutaro Tatsumi), who had just graduated from the military academy, was assigned as the captain of a sentry patrol in Beiman, which was located on the opposite side of the Heilongjiang River from the Semidomka region of the Soviet Union. His predecessor, Lieutenant Kishi (Kawamura Kenichiro), a mild-mannered middle-aged man, had earned the trust of his men and the villagers by relaxing his military duties. However, newly appointed Lieutenant Kagawa thinks that Kishi's way of doing things is sloppy and begins to train the soldiers furiously in order to teach them a lesson.