The Beast Master Thinks I'm Too Lazy, so I'm Going Crazy by Upgrading Alone.

Jiang Ran traveled to a world where everyone changed jobs and awakened to the profession of beast master, but was ridiculed by everyone as the most trashy and expensive profession. The school beauty girlfriend broke up with him in public and turned to Huang Mao. The family is poor, and raising beasts is extremely expensive. So Jiang Ran casually contracted an Erha as a pet, and then went home to hang it on the wall and lay it down. However, there seemed to be something "wrong" with his beast control at this time. ["Snowfield Dog" feels that he has the appearance of a beast king and is unwilling to be reduced to a pet! [In order to prove itself, it voluntarily ran away from home, started killing crazily, and continued to level up and grow! Congratulations! Your beast has successfully evolved and become a warrior-level sky-breaking dog! Congratulations! Your beast master evolves again and becomes a Lord-level Thunder Sword Dog] … Congratulations! Your beast master breaks through the limits of bloodline and evolves into the mythical Chaos Thunder Emperor! Not only that, Jiang Ran's other beasts seem to be King Juan... While professionals at the same time were still struggling to kill monsters and level up in low-level dungeons, Jiang Ran had already formed an army by himself, sweeping through all major high-level dungeons with his god-level beast pets. … A few months later, during the national exam, Jiang Ran swept through the geniuses with his god-level beast control, and shocked everyone. The ex-girlfriend even begged for reconciliation and forgiveness. However, Jiang Ran just said lightly: "Would Ning deserve it?"