You are a heroine from the future who accidentally married Ryu Jun Yeol, a King from another kingdom who was supposed to marry another women but the marriage was only due to his family's plans but he doesn't know about you.

You pretend to be his fake wife because you are assigned to carry out a mission to find a treasure from the future to save humanity in the future.

At the first night after the wedding, they were at their own chamber to have their first night together.