A job seeker brother-in-law happens to find a man's wallet. But the guy is weird. His sickly face is covered with blood, and his wallet contains yen. The next day, when Hyeong Woo finds out again, two gangsters chase the man into a secluded place. After a while, he approached him, and the gangsters were bloodied and collapsed, and the mysterious man disappeared without a trace. Eventually, Hyeong Woo goes to find the man and enters an unexpected world step by step.

One day, a mysterious creature grows on Nam-joon's shoulder.