Villainous Saint: The Female Lead Breaks Down After I Give Up

Gu Jiuyuan transmigrates into a book and becomes a villainous holy son who fawns over the heroine. Knowing the plot, he decides to give up and coast! Whoever wants to be the villain can have the job! Fawn over the heroine? No way! Make things hard for the protagonist? Impossible! Explore a secret realm? Whoever wants to go can go! All he does every day is slack off and coast, occasionally heading to a pleasure house to listen to music, until he proves himself an Emperor through the System and takes on the Mandate of Heaven. Then he suddenly remembers the protagonist. Without a villain like him suppressing the protagonist and giving him experience, is the protagonist still stuck in the Qi Refining Realm? Gu Jiuyuan springs into action! "You Qi Refining Realm loser of a protagonist, take this supreme Dao Emperor weapon!"