
The protagonist, Xiao Fan, was originally a recent graduate in Chinese literature from university. His soul transmigrates to the body of a newborn baby who had just died in another world.
At thirteen, he becomes a Xiucai scholar. At sixteen, he passes the provincial exam. At seventeen, he becomes a Gongshi tributary scholar. Subsequently, he is selected by the crown prince and becomes the prince's attendant reader.
The crown prince, Qin Xuan, has an engagement with Jiang Yuli, the granddaughter of the Duke of Zhen Guo. As the grand wedding approaches, Prince Qin Xuan approaches Xiao Fan and asks him to substitute for the consummation of the marriage.
Xiao Fan is shocked: cuckolding the prince, isn't that suicidal?
Helpless, the prince reveals that she is actually a woman. Her real name is Qin Xuan, and she is of unparalleled beauty.
Knowing this secret and refusing to agree means death, so Xiao Fan has no choice but to comply.
At the critical moment, the system finally awakens. He possesses the Supreme Sign-in System, which claims that nothing cannot be obtained through sign-in.
"System, can I sign in to obtain another system?"
"System, can I sign in to obtain a universe?"