As the holiday approaches, Qiangzi (Bolin Chen), a Chinese teacher in Korean(Busan), meets up with his best friends San’er (Zhenyu Qiao), Dato (Wenbo Ding), and his younger brother Pappa (Xuwen Yang), who have traveled all the way from China, to take a break on Korean(Jeju) Island. A raging punk, a sexy Korean woman (Ye-jin Son), a persistent old cop (Kwang Jang), a mysterious tailgater (Hyun-jun Shin), and an offbeat priest (Chul-min Park) show up one after another. The long-awaited journey is made to look like everyone has done something bad in the presence of these people. Then a mysterious little black pig appears and makes everyone kill each other, and pushes them all into a life-or-death crisis ……

How do we get out of this situation? Who is the real “bad guy” who deserves to die?