Ying Yuan and Yu Sifeng are CPs and the absolute protagonists. There may be a story about them traveling through the world later.
The story originated when Yu Sifeng was asked by the Grand Palace Master to deliver elixirs to the heaven. Unexpectedly, Yu Sifeng was forced to bind the system and became the emperor's exclusive firefighter.
Because of the system, Yu Sifeng had to do system tasks at first, but soon he slowly lost his heart to the emperor.
And the emperor himself soon lost his heart to a little demon.
For the Grand Palace Master, he had lost the elixir and his precious apprentice, and the deal was a huge loss.
It is true that my apprentice will never return to heaven once he goes to heaven!
