Dong Soo has tic disorder and, because of this, sometimes swears without knowing. He works as a delivery man. Dong Soo makes deliveries to Ye Ri’s rooftop apartment twice a week. Since her younger sibling died, Ye Ri suffers from heavy guilt and stays inside now. Ye Ri then publishes an online novel. Her novel is her way to connect with the outside world. Ye Ri is comforted by Dong Soo’s voice.With their twice-a-week visits, Dong Soo and Ye Ri open up to each other and begin to talk. Ye Ri tells Dong-Soo about her younger sibling’s story and her sibling’s wish to see the sea without water. Dong Soo decides to make her wish come true. Ye Ri is finally able to leave her small apartment and see the sea without water.