(No harem, no formulaic tropes, no invincible protagonist, no System, no mindless plot, no wish-fulfillment. Read at your own discretion.)
Han Yan, an orphan whose parents died when he was young, makes a living by stealing. By chance, he stabs a gang leader on the bounty list to death, and from then on becomes an assassin. When a mission goes wrong, his hands and feet are broken and he is locked in a dark room. As he waits for his fate to be sealed, an electronic voice rings in his ears: “Player Han Yan detected. Would you like to participate in the Lethal Game? Consider carefully. Players really do die in this game.” With no way out, Han Yan decisively chooses to join. He never expected it to be a game that sends him transmigrating through countless worlds, killing for the rest of his life.