Yeonjun is studying at university and has a childhood friend, Soobin. He and Soobin have been friends for many years and they entered the same university.

Yeonjun often hangs out at Soobin's house, chatting with his parents and interning at a video game development company. In the summer, Soobin's younger brother returns home. He studied abroad and Soobin's parents decided that Soobin's younger brother would continue to study in Korea. Yeonjun hasn't seen Soobin's little brother for years.