The Strongest Spirit Summoner: Golden Flash from the Start, Invincible

The male lead, Sun Mingze, was once a cancer patient living on Earth. After dying of his illness, he was reborn on Blue Star, a world very much like Earth. But after the spiritual qi revival, everyone in this world began changing professions to fight invasions from other realms and suppress secret realms. After being reborn, the male lead has a healthy body and changes profession to become a Spirit Caller, a class considered utterly useless by everyone else. Yet Sun Mingze takes this profession to new heights and rises to the top of the world.