Hae-Gon, Joon-Hyung and Hak-Rak are everyday guys, working at a local taxi company. Men of marked individuality, many wonder how they keep company with each other. After a bulky day of work, one and only diversion they can share is drinking in a local bar with silly jokes. Discontented with their miserable life, they finally decide to do something big, which they believe this is very and last opportunity to take an abrupt turn of their life. However, their plan makes a wrong turn, just like their pathetic life.

The border of 820 is where the North and South Koreas stand face to face. Elite female lieutenant Kwon Jin-kyeong from the Korean Military Academy and 4 other cavalry battalions are on patrol on their last day of training. Meanwhile, students from the photography club get lost on their way to check out scenery and enter BAse 820. An unknown shot is fired and the group is terrified. Kwon Jin-kyeong and her team look for the source of the shot...

A teenage girl is captured by a giant mutated squid-like creature that appears from Seoul's Han River after toxic waste was dumped in it, prompting her family into a frantic search for her.