Delivery boy Lu Xun's left eye can see that the world is decaying - the world is filled with strange things and the rules are distorted. Forced to become a "walker" to clean up pollution, his left eye continues to evolve, but he is also involved in a shocking conspiracy: he is actually an experimental subject that connects reality and the upside-down city. When the two worlds are on the verge of fusion and collapse, he must make a choice: take out the core of balance in his eyes and lose all abilities, or become an eternal bridge and guard alone between the two worlds.
