My Career Can Level Up Without Limit

In the age when everyone changes class, Gu Qing awakened the most embarrassing dual classes in history: the Simp Apostle and the Undead Apprentice. One gains Simp experience by fawning over members of the opposite sex, while the other cannot even summon a skeleton soldier. Fortunately, Gu Qing can advance his classes without limit, simplify the advancement requirements, and even unlock new class promotions. [Undead Apprentice advancement requirement simplified... Gain advancement experience automatically in places rich with deathly aura] Gu Qing stood in a mass grave. Moments later, his class advancement succeeded. [Simp Apostle] - [Phantom Pactmaker] - [Abyssal Favorite Lord] - [Lord of Ten Thousand Charms] - [Forbidden Charm Emperor] - [Charm God of the Myriad Heavens] [Undead Apprentice] - [Necromancer] - [Undead Lord] - [Death Monarch] - [Undying Emperor] - [Lord of the Underworld] - [Eternal God of Death] New classes unlocked, with advancement continuing: [Shadow Sovereign], [Blood Emperor], [God of Cooking]… But why does the Simp Apostle become stranger and stranger after advancing? Demon Queen, Elven Queen, Fallen Saintess, Vampire Princess, Fallen Angel… Why are all these abyssal beauties desperately clinging to me? What the hell is a reversed master-servant contract? Wait, what do you mean that since I have become your master, I have to water the flowers of your desire every day?