Family court judge Clémence lives with Gabriel, who she is very much in love with. However, she is jealous and suspects him of cheating on her. One day, she decides to put his faithfulness to the test during a trip to the Reunion.
Yujeong, who works as a night shift nurse at a general hospital's cardiology department, is now told that her 12th-grade younger sister, Kijeong, has been arrested by the police as a suspect in an infant abandonment case. Only then does Yujeong start to make desperate efforts to rescue her sister.