I Transmigrated Back After the Male Lead Went Off the Rails

Lin Xi died of leukemia at a young age, then transmigrated into a cultivation novel aimed at male readers, where the protagonist grows stronger with every stage. The System told him that as long as the male lead completed the plot successfully, Lin Xi would have a chance to come back to life. So Lin Xi brought home the male lead when he was still a baby, raised him to adulthood, and took him as his disciple, staying by his side every moment to keep him safe. After the plot was complete, Lin Xi faked his death and waited for his chance to come back to life. But Lin Xi: "Why am I still in this world?" System: "Sweetie~ You came back to life in the original world~" Even more unbelievable, the upright protagonist had fallen and become a Demon Lord. * Everyone knew that Yu Fusheng, a once-in-a-generation talent, had been secretly in love with someone for years. After that person died, he fell into demonic cultivation. One day, the Demon Lord picked out a young man from among his many male companions, someone who looked just like the person he had loved. Everyone: Oh! A dramatic, angsty substitute romance! They didn't dare tell the young man that he was only a substitute. Instead, they secretly waited for him to suffer both physical and emotional torment. Until one day, they heard the Demon Lord announce with their own ears, "Next month, I will become Dao partners with Lin Xi. Everyone is welcome to attend the ceremony." Everyone: He even gave the substitute the same name. That young man has it so rough. On the day of the ceremony, the young man glanced down at the crowd and said lightly, "Lin Xi of Yufeng Mountain wishes to become Dao partners with his disciple, Yu Fusheng." Everyone: !!! Wasn't Lin Xi dead?! That day, they once again felt the terror of being under Lin Xi's thumb. *Note: A devoted couple, master and disciple, with the younger partner as the pursuer. Theme: Uphold the core values of socialism, be independent and self-reliant, and work hard.