To the world, Lee Ji-hoon is the ruthless CEO who has everything. But his empire is built on a lie, and his family is a viper's nest of betrayal. To survive, he needs a silent partner?a bride who will play her part without question. Yoo Eun-ha, an ordinary woman with a desperate secret, is the perfect candidate.

Their fake marriage is a fragile truce, a temporary arrangement to get them both what they want. But when a rival with a thirst for power uncovers a hidden truth from Ji-hoon's past, their contract is no longer just a business deal. It's a matter of life and death. Now, trapped in a dangerous game where every move is watched and every secret could be a weapon, Eun-ha must decide if she can trust the man with the gilded heart, or if he's the one she should fear most of all.