The door that was attached to a waste of space was the door that led to another space?!

Hosu, who used to move a lot because of his parents' work, finds a strange door in their new house.

And he meets Seungwoo, a boy of the same age who lives across the door.

The two boys, who shared a mysterious experience, began to come and go through the door.

Warm air permeates between the two like a late afternoon.

And slowly another secret grows in the hearts of the boys...