Kang Dou (Song Kanghao) is an ordinary and somewhat confused middle-aged man. He lives with his daughter Hyun Su (Go Ya-sung) and his family, runs a small shop by the Han River, and lives a quiet and peaceful life. Kang Dou's father Hee Bong (Bian Hee Bong) is a kind old man, and his younger brother Nam Il (Park Hae Il) is the only college student in the family, but he is unemployed. He often complains and drinks, and is dissatisfied with reality. His younger sister Nam Joo (Bae Doona) is an archery athlete, but she often loses her chain at critical moments. One day, people gathered by the Han River and were surprised to find an unknown monster that had never been seen before climbing on the pier of the bridge. Suddenly the monster rushed to the shore and rushed into the crowd of onlookers. Kang Dou wanted to escape with his daughter immediately, but Hyun Su was captured by the monster. This ordinary family suffered an unprecedented blow, and the whole city was also facing a great enemy. How should they face the monster?