You're in an arrange marriaged with the emperor, Heeseung. Your family send you to Heeseung's kingdom to be an empress. But, your relationship with Heeseung is a mess, he's so arrogant and cold towards you.

What you didn't know; Heeseung secretly has feelings for you.

You're currently laying on your bed because you have a fever. The imperial doctors is nervous because while they're checking you, Heeseung is watching, seriously.

"If she dies, you guys die too."

It's just a fever...