Jeong-hye gives a birth to a baby boy in the prison. Her and other inmates create a women's choir to compete in the national choir contest, to meet and greet their families and loving ones.
Nam-hee (Shim Hye-Jin) is going about selling fruit from her truck, when she nearly runs over a young gentleman, Joon (Lee Sang-Woo). Joon finds his way to Nam-hee's house, where he meets her mother Gan-nan (Kim Su-Mi), and her 20-year-old daughter Na-rae (Da-hee Lee). Through a series of circumstances, Joon comes to live with the three women, and with the introduction of a handsome man in their house, the three use their own skills to vie for his attention and compete for his affection.
The 'boy' fights with his mother from morning and leaves home. On the bus to the mountain, he meets 'younger sister' and her 'older sister', who go hiking after a long time. However, the 'boy' was kicked out of the bus after being found to have paid less bus fare.
It follows Chung-sik, a dedicated Drug Squad detective, and his ex-wife's current veterinarian husband, Min-seok, as they rescue her from a dangerous criminal organisation.