After Being Reborn, the Male Lead Became a Great Demon

Possessive, gloomy seme x sunny, lively uke You Yi transmigrated into the novel he wrote, becoming the male lead's senior brother. After struggling through countless trials with the System and completing his mission, he died and returned to the real world. When he woke up, the System had dragged him back into the novel. You Yi (furious): “What the heck is going on? Ahhhhh?!” System: “If I hadn't brought you back, this world would be doomed! After you died, the male lead wanted to make everyone die with him!” You Yi (calming down, and feeling a little moved): “Sigh, what touching brotherly love. No wonder he's the kid I raised.” System: “...” (Hesitates to speak.) You Yi: “So what's the mission this time?” System: “Persuade the male lead to return to the right path.” You Yi: “Sure... Wait, what? My male lead was always a paragon of virtue!” System: “No. After you died, he became a great demon.” You Yi died for his virtuous male lead. You Yi came back to life and discovered that the male lead had become a great demon. You Yi: “Senior, you're so heartbroken. You must have been very close to that fellow cultivator who passed away, right?” Male lead: “No. We were dao companions.” System: (Immediately logs off.) The top and bottom are indicated in the character list. Theme: No matter how difficult life's road may be, stay true to yourself and never make common cause with evil.