To save her grandmother's beloved flower shop, Eun-byul makes a deal with the devil-or, more accurately, with a man who is rumored to have no heart. Han Jae-hwan, the ruthless CEO of Han Industries, needs a temporary fianc e to secure a crucial merger before Christmas.
The rules are simple: play the part, don't ask questions, and never, ever fall in love. But as a blizzard traps them in a penthouse filled with secrets and simmering tension, their perfect lie begins to crumble. As the lines blur between the contract and the heart, Eun-byul must decide if she can heal a man haunted by a ghost, or if she's just the final rule in a game he's destined to lose.