After Seon-yoo's father committed suicide leaving behind a large sum of debt for them, Mother and 12-year-old Seon-yoo move to a new place to have new start.

The curse of the darkness where the sun does not rise has fallen on the world, and Turandot, who has a cold heart, receives proposals from many men for his beautiful beauty. She comes up with three riddles as a condition for accepting the proposal, and anyone who fails to solve them turns to stone and dies. Calaf, the prince of the Balkan Kingdom, also solves her riddle and proposes... Turandot, a woman who does not believe in true love. Calaf, the only person who can move her heart. What will be the fate of the two?