Mortal Body Hides an Emperor

He was once the supreme emperor of all ages, at the end of the Dao, a single thought could annihilate a realm. During his final tribulation, he was betrayed by the Heavenly Dao, and a remnant of his soul was reborn as a lowly handyman in a lower sect—poor spiritual roots, no cultivation, bullied by everyone. On the first day of rebirth, his fellow disciples stole his steamed bun. On the second day, the elders ordered him around like a dog. On the third day, the 'Myriad Realms System' sent by the Heavenly Dao to harvest prodigies came knocking, ready to forcibly bind him. Then the system panicked. 'Detecting host... detecting... detecting... Ding! System error! This is not a prodigy! This is... the supreme emperor of all ages?!' The system immediately knelt and acknowledged its master, becoming a humble sycophant, responsible for running errands, delivering news, sending opportunities, cleaning up messes, and helping the protagonist keep a low profile. Facing a prodigy's provocation, the system says: 'Your Majesty, calm down! Such an ant is not worthy of your hand!' Facing an ancient inheritance, the system says: 'All trash Your Majesty discarded back then, I've kept it for you!' Facing the worship of myriad races, the system says: 'They don't know the true emperor is right here in the crowd, I'm about to burst from holding it in!' The protagonist just wants to live quietly as a mortal, but the system kneels and begs him: 'Your Majesty, could you please be a little invincible? My performance is about to hit rock bottom...' This is a story of an emperor forced to be invincible, a system begging for face, the whole world in shock, but the protagonist just wants to sleep.