Yong Sheng is a Chinese Donghua about Fang Han, a former slave who was taken in by the highly respected and wealthy Fang family. Little did they know, a rival sect had sent an assassin to eliminate the Fang family's prized possession, Fang Qingxue, a female disciple who was studying directly under the sect leader. However, the assassin was unable to carry out his mission and, on the brink of death, he met Fang Han.

The assassin entrusted Fang Han with a powerful cultivation artifact and tasked him with killing Fang Qingxue on behalf of the rival sect. With newfound powers, Fang Han begins his journey from a commoner slave to a master, guided by a special master who remains in hibernation until Fang Han attains sufficient cultivation to awaken it. How will Fang Han navigate this tumultuous path?