In the strange city where gears dance with Mayan totems, cultural relic restorer Long Chen lives cautiously until he meets dinosaur trainer Yu Yan who has a dragon-shaped birthmark carved on his left arm. The gears in the fossil are engraved with her real name, and the collective nightmare predicts the wail of the mechanical dragon. At the bottom of the city, the gear AI with consciousness begins to rebel. They traced the truth and discovered that this steam-roaring city was actually a cage imprisoning the ancient mechanical dragon clan. What's even more cruel is that the "Lord of Time", the man behind the scenes who intends to obliterate all possibilities of time travel and claims to be the savior, is actually Long Chen's already crazy self from the future. When the echoes of history, the mystery of identity and the paradox of time come together, they must find a third way - to build an ark that carries all the pain on the ruins of the torrent of time.
