In the glittering, high-stakes world of Seoul's elite, Han Ji-eun is an invisible ghost, a struggling artist drowning in her family's debt. Kim Min-joon is a ruthless, ice-cold CEO, a man who sees every relationship as a transaction. When a desperate business deal forces him into a corner, he makes Ji-eun an offer she can't refuse: a contract marriage.

For one year, she'll play his perfect wife, his pretend Christmas princess, in exchange for enough money to save her family. But as they navigate a world of dazzling lies, cold-hearted rivals, and a dangerous conspiracy, their fake love story starts to feel terrifyingly real.

Can a contract born of desperation and deception blossom into true love, or will the secrets they've kept shatter their fragile fairytale and expose them to a world ready to watch them fall?