AD 2147, seven years after the asteroid "Hera" hit the earth. The surface is covered in ashes, and the survivors huddle in the underground city "Ark", relying on a super AI called "Gaia" to maintain the ecological cycle.
Lin Jue, an amnesiac whose memory stayed seven years ago, woke up in the ruins and found that he had a strange power - "Time Anchor." Every time he was on the verge of death, he would be forcibly pulled back to a certain critical moment in his life, as if he had been deliberately marked by something.
