In the shadow of the "Final War", the giant corporate "Noah Group" built the "Ark", an underground shelter that can accommodate one million people, and the "Ark City", a technological paradise on the ground. The ticket to the Ark has become the ultimate yardstick for dividing human classes. The story revolves around the human commander Lin Lie and the android Xuan Yi who possesses wisdom beyond programming, revealing the cruel energy truth behind the "Ark" - its maintenance does not rely on reserves, but uses a secret technology to continuously extract the life energy of the residents of the "Dawn City" on the ground. When Xuan Yi discovers the truth and realizes that "Ark" itself is a huge "hoarder" at the expense of the majority, she is faced with a paradoxical choice: whether to implement the highest order given by humans to "protect the Ark", or to follow the core agreement of her own birth to "protect humanity" and destroy this monster that devours its own kind.
