Ying Yuan and Yu Sifeng are the central couple and the absolute leads. Later on, they may travel through other worlds.
The story begins when the Grand Palace Master orders Yu Sifeng to deliver spirit medicine to the Celestial Realm. Unexpectedly, Yu Sifeng is forced to bind himself to a System and becomes the Emperor's personal troubleshooter.
At first, the System makes Yu Sifeng carry out its tasks, but before long, he gradually gives his heart to the Emperor.
The Emperor, for his part, soon gives his heart to a little demon.
As far as the Grand Palace Master is concerned, he has lost both the spirit medicine and his precious disciple. This deal has been a huge loss.
His disciple really has gone to the Celestial Realm and never come back!
