After their serial killer father is imprisoned, Sung-min, his three siblings, and his mother move to a tranquil country cottage in Taiwan. Sung-min meets a local girl, Rihwa, and dreams of a fresh start. However, tragedy strikes when Sung-min's mother suddenly dies. Fearing her children being sent to orphanages, she asks Sung-min to keep her death a secret until he becomes an adult in six months. He follows her will and lives on with his siblings until a major disruption occurs. Will Sung-min be able to save his siblings?