Millennium Cultivation: I Return as the Untouchable

After cultivating for a millennium to become the Immortal Emperor, I return only to find my home stolen? My mother sells her blood, my fiancée calls off the engagement, and commoners ride me while defecating on my head? Bai Ye smiles. In this world, I am the Heavenly Dao! The Demon Sect tries to assassinate me? Destroyed! Noble families challenge me? Killed! The Martial God bottleneck? I break it with a single word! The pills I casually pull out are treated as national treasures, but the trash I throw on the road turns out to be an ancient artifact. I push forward relentlessly, from breaking off the engagement ceremony to defeating hidden sects. Everyone thinks I'm just an ordinary genius until the Demon Lord descends, gets slapped away by me, and the whole world explodes. They promised I'd be useless, but how did I become the supreme ruler of all realms?