In his previous life, S-class "constructor" Lin Xiao was betrayed by his brother and loved one, and the city was destroyed and everyone died. Reborn one month before the alien beast arrived, he retained all his memories. In this life, he no longer trusts anyone, uses all means to hoard resources crazily, and makes the most rational transactions with the country. When the doomsday comes and others are struggling, he is arming the entire city with a black technology matrix; when the enemy comes to ask for help, he smiles and activates the plasma cannon on the city wall.
