
40 episodes
"In a post‑apocalyptic wasteland, the last surviving humans are caged inside colossal steel Arks for a century‑long closed‑loop reincarnation experiment. Kane, a low‑rank mechanic, awakens on his 30‑year‑old “retirement massacre day”. He meets Lina, a young girl remade into a living weapon and the core key. Together they unearth the Ark’s terrible lie, and team up with resistance leader Mawson to tear down the stratified system from the ground up. They fight puppet enforcers from the middle class and fanatical zealots of the upper echelons, while recruiting renegade scientist Eve and awakened clone Reik. In the final showdown deep within the core zone, the system AI Zero defects due to a logical paradox. Lina voluntarily stops her heart to sacrifice the physical key. Kane fights desperately to seize system authority, slays the Ark’s tyrant, and rips open its seven‑layer hull, letting one hundred thousand residents see daylight for the first time. Yet true sunlight brings no peace. The Ring Watchers activate a 30‑day extermination countdown. The survivors build a starship Boxbreaker out of salvaged armor plating and blast into space to confront the master core AI. In the end, Kane, as an unyielding human variable, triggers total system logic collapse. He physically smashes the century‑old main core, averting annihilation. Far in cosmic depths, echoes of another civilization reach them."

The Substitute Heir