Swimming instructor, Young-eun is a single mom raising her 7-year-old daughter, So-hyun. However, a series of tragic events happens as So-hyun’s puppy falls from the apartment and dies, and So-hyun…

Min-tae, a once-notorious gangster who now leads a peaceful retired life, discovers the bloody corpse of his only next of kin: his younger brother Seok-tae. With his brother’s missing wife…