The abandoned aquatic station in Longquan Ditch welcomes the countdown to sealing its well, where clearance oversights trap Chen Chuan who is inspecting inside a branch tunnel. Cold spring water suddenly gushes forth and bursts open the well lid, and a rare golden soil carp comes out with the water. At the same time, Chen Chuan finds the old flow measurement booklet left behind by his father Chen Shouyi, filled densely with water source early-warning records. Aquatic technician Su He promptly stops everyone from hyping up the divine fish, insists on scientific water testing, and wins the precious time of a seven-day postponement for sealing the well. Enterprise head Liang Wanjun continuously exerts pressure with funds and orders, forcing everyone to make a difficult choice between profits and ecological red lines. The truth behind the accident sealed for twenty years is slowly unveiled.