PE class, where the children play soccer in full swing on the playground. A strange man appears with a gift box in front of Minsu, who is busy playing mischief here and there in the classroom. A few years after his divorce, Min-su tells a man who brought his son, 'Hun-i', a birthday present, that Hoon-i did not come to school. However, Minsu says that he knows where Hoon is. In the end, the man and the man set out to find Hoon... Can Minsu and the man meet Hoon?