Apocalypse Outpost: The Fragment Cipher and Self-Redemption

Before the apocalypse, the protagonist is a construction worker: honest, kind, exceptionally resilient, and deeply loyal to those he cares about. At first, he is timid and passive. After awakening his System, he is forced to grow, gradually becoming brave and responsible. He has the special identity of a "vessel for the energy of heaven and earth," and ultimately sacrifices himself to stop the apocalypse. His defining trait is greatness in the ordinary: he grows from a reluctant participant into a protector.