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One hundred and fifteen years ago, following a meteor shower, terrifying alien bugs invaded the earth. Facing the Zerg with strange abilities and various types, mankind was completely defeated. Fortunately, the zerg were unable to cross the sea. So, mankind launched the sea city project. As time goes by, more and more people are unwilling to counterattack on land, and just want to stay in the sea city and develop comfortably. But the Zerg race has not stopped evolving. A young man wants to change this situation and become the savior of mankind. But in the end, he discovered that he might be mankind's biggest enemy.

The end of the world is coming, order has collapsed, and humanity is about to perish. At the critical moment, the system descended from heaven and attached itself to Wen Renyu. Railway train system at your service!