After transmigrating into the role of a doomed noblewoman, Yuna York wakes up only to be rejected and slapped by the Crown Prince. To stay alive, she kisses the empire's most feared and powerful "eunuch", Nolan Channing. But beneath his cold exterior lies a man capable of deep devotion. As she struggles to survive by winning Nolan's favor while saving her family from tragedy, Yuna gradually changes both their fates.