Choi Eun-jong

In the year 2020, a small number of Alien Research Club members gather in underground bunkers, having survived the invasion of yellow liquid aliens. Chaos ensues when an alien gets into the body of one of the members. And they realize everyone will die if they don't find and kill the alien within 30 minutes. Can these last survivors finally be safe in the face of the alien invasion?

The story begins one year before "Dokgo" (before Kang Hyuk seeks revenge for his twin brother). Kang Hyuk and his mischievous friends meet Kim Gyu Soon and decide to help him protect his sister. Things escalate and Kang Hyuk and his friends end up fighting against high school delinquent gangs.