Fang Mu unexpectedly transmigrates to the day Qin Shi Huang ascends the throne, frightening the emperor so badly he nearly dies. Just as Fang Mu is about to be dragged off for execution, he comes up with a quick-witted plan...
Fang Mu then uses modern medicine and music to make a name for himself in the Qin dynasty, even becoming Qin Shi Huang's son-in-law...
But good times don't last. Qin Shi Huang orders Fang Mu to join Xu Fu in searching for the elixir of immortality, leaving Fang Mu no choice but to flee.
He had planned to help Qin Shi Huang eliminate Zhao Gao and shore up the Qin dynasty, but now he can only let history take its course, befriend Xiang Yu and Liu Bang, and become Han Xin's patron, all so he and the princess can make it out unscathed in the end...