An ordinary architect, a powerful CEO, and a Christmas party that changes everything. Min-ji just wanted to get her career on track. Kwon Tae-jun just wanted to secure his company's future. He's cold, ruthless, and he needs a fake fiancée.

She's in a desperate financial situation and needs a way out. Their contract is simple: a year-long engagement, no emotions, and a clear end date. But as their lives become entangled in a web of corporate espionage, family secrets, and a past steeped in revenge, the line between performance and reality begins to blur. Can a love born from a lie become the most real thing of all?