A mysterious child and a mysterious case. Woo Kyung has been living a diligent life, as a good daughter and a good mother who also works as a child development consultant. She was a proud, responsible woman who fulfilled the needs of her family and the community. One day, a mysterious incident creates a rift in her world. A rift that would shatter her whole world and turn her life upside down. The only person she can rely on is Ji Heon, a Violent Crimes Unit detective, who is willing to listen to what she has to say.