Immortal Emperor’s Direct Grandson from the Start, and You Want Me to Level Up by Slaughtering Pigs?

Ye Xuan transmigrated, but not as a commoner at the bottom of society, nor as a good-for-nothing from a prominent family who was bullied and oppressed. Instead, he transmigrated as the sole grandson of Ye Daoyi, Supreme Elder of the Heavenly Dao Sect, the highest power in the Immortal Realm. He was doted on by everyone and possessed the supreme immortal physique known as the Heavenly Dao Body. The Demon Realm's Demon Lord was his bodyguard, the Immortal Realm's Holy Maiden was his maid, and he had an endless supply of resources. Then, just as all this was happening, he awakened an [Infinite Comeback System]. The System's first mission was to have him slaughter pigs to level up?