After Jin Hao and Zhong Da go on a blind date, he accidentally swaps bodies with a boy who had a crush on Jin Hao, exchanging family members by mistake.

In 12th-century China, an ambassador is killed and a letter meant for the emperor is stolen. As the search for the letter unfolds, alliances are formed, secrets are revealed and no one can stop the truth that's destined to leave its mark on history.