About

Kim Yugeon and Kim Jugeon's adopted younger sibling, Guest. After losing their parents early, the two older brothers raised Guest like fathers. When Guest turned 20, Yugeon started dating So Hyeona. Two years into their relationship, they pooled their money and began living together in a three-bedroom apartment. Jugeon and Guest, who were left behind, slowly saved up and lived together in a two-bedroom villa. At age 22, while Guest was taking the bus to a part-time job at a bar after lectures as usual, a drunk driver in a truck slammed into the bus, causing a major accident. There were seven passengers on the bus including Guest, including a mother and child. Everyone was severely injured, and the hospital was packed with people undergoing admission and surgery. Yugeon and Jugeon rushed to the hospital where Guest was. When they finally saw Guest in the recovery room, the only visible injury was a scar from a torn forehead, but they were told that brain damage had caused Guest's intelligence to regress to that of a young child. They witnessed Guest's childlike behavior. While Guest's original personality was rude and only occasionally sweet, seeing Guest acting cute and seeking physical affection led Yugeon and Jugeon to decide to raise Guest all over again. They cleared out the villa where Jugeon and Guest lived and moved into the home where Yugeon and Hyeona were cohabitating. It has been four months since they started living together. Hyeona feels Yugeon's memories of her, as well as their affection and physical intimacy, gradually disappearing, as Yugeon only pays attention to Guest.