Xiang Shaolong (Louis Koo), a member of the special forces in the 21st century, is determined to participate in the study of time and space travel in order to restore his love. However, due to the error in the data of the time machine, Shaolong was brought to the warring States period. At that time, Luo Zheng (Lin Feng) had not yet ascended the throne and was imprisoned in the State of Zhao. In order to return to the future, Shaolong spared no effort to help Yizheng ascend the throne smoothly. Because of Shaolong's resourcefulness and special status, his ability was appreciated by everyone, so he was also plotted by many treacherous people. In the case of the enemy, the flirtatious Shaolong is also entangled in a complex quadrangular relationship. Can Shaolong help Yizheng win the world? How will he deal with his relationship with his lover?