A crossover quick-transmigration story with a System. The System doesn’t play a major role; it’s only there to support the protagonist.
The protagonist can be male or female, and takes on a different persona in each world. They’re not a self-sacrificing saint, but will save some people from their fates as long as it doesn’t harm them. There’s no fixed couple; relationships will depend on the author’s preference.
(The first world is Yongzheng’s. I personally like Yongzheng a lot and don’t want to offend him. In other worlds, I’ll write according to the name of the character I transmigrate into.)