Joo-yoon, who raises a stray dog, grew up without knowing her father. Every time she misses her father, she imagines he must resemble the actor Chow Yun-fat. After her mother passes away, she learns that she and her sisters have different fathers. One day, an acquaintance calls her stray dog "a mongrel without a known father," sparking a fight, and she also learns her roommate is pregnant. Amidst conflicts with her roommate, who plans to have a child without a father, Joo-yoon recalls her own wounds and enters the womb at the moment of her birth to confront her own reflection.