I, the Fallen Angel, Bury the Gods of Olympus

Orphan Qin You makes a living doing backbreaking work at a lowly dock, but accidentally gets caught up in a live human sacrifice conducted by an organization of supernatural ability users. After dying, he awakens the mysterious "Asura Fallen Heaven Palace." This is a special space-time that fuses the Eastern underworld with the Western hell, where Qin You can cultivate for a thousand times longer than in reality and coexist with the remnant soul of a fallen angel parasitizing his body. In an alternate ancient Greek world where the gods have been corrupted by indescribable forces and their sanity has collapsed, Qin You is forced to accept a series of evil god quests just to survive. Starting as a lowly commoner, he slays monsters, cuts down false gods, and refines divine artifacts, ultimately uncovering the truth: this world has been infested by Cthulhu deities. With a single thought, he becomes a demon and leads awakened NPC commoners in bringing the rotten Mount Olympus to its final end.