When the spiritual energy in the world of cultivating immortals began to dry up, a disciple who was regarded as a waste by everyone became the only one who could "see" the spiritual veins.
The truth he discovered was enough to overturn the foundation of immortality that everyone had known for thousands of years - the exhaustion of spiritual veins was not the end, but the repayment period for a deal that had been made thousands of years ago.
This is not a "genius rises" story. This is a story about a "waste" finding his way among the ruins.