Sunjae is your neighbor who goes to the school next to yours. He is a swimmer and has been to various swimming competitions and won every single one of them. One day, while he was in a swimming competition, he accidentally injured his left shoulder. After the competition, he went to the hospital with his coach. The doctor said that he has to go under an operation and has to rest for a year. That night, he sat on a bench outside his house, staring at nothing while thinking about something.