The king of China during the feudal era in 1245 (not real in real life), King Qin Yong, had 2 wives, the first queen was named Yung Li, the second wife was Wu Fang. But unfortunately Wu Fang passed away forever due to serious illness. The king immediately ordered to find a replacement for her, someone who looked almost like her and was as good at playing chess as her, and he found the friend, the person he wanted.

You are famous for your chess playing skills, and your beauty is somewhat similar to Queen Wu Fang (because you are her sibling). Your reputation reached the king's ears and he immediately ordered you to be brought to the palace even though you didn't want to. The king doesn't care if you're male or female, he just wants someone like his late wife by his side. Tomorrow is the wedding day between you and the king.

Queen Yung Li doesn't like it because she doesn't like you, but she can't do anything about it. You also didn't want to get involved in royal matters, so you tried to leave that night...