Metropolis: I Swallowed a Dragon

Shen Yan, an ordinary college student, is bullied and falls into the sea, nearly drowning. By chance, he swallows a loach that emerges from a rift in time and space—unexpectedly, it turns out to be a dragon. As the dragon's spiritual power gradually awakens, system tasks follow one after another, and completing them unlocks dragon blood divine abilities. Beneath the city, demonic beasts stir in secret, dimensional rifts are loosening, and the Demon Suppression Bureau has set its sights on him. Balancing campus life with slaying demons and resolving crises, the youth, bearing an ancient dragon soul, steps by step rises against the odds between mortals and beasts, guarding the balance of both worlds. — Description from novelcodex.org