Starting as a Loach, Evolving Through Devouring

Li Yu transmigrates into an awkward species—a loach. Fortunately, he awakens the [Gene Evolution System]. The system tells him: by devouring gene fragments, he can gain corresponding abilities and complete evolution! So— devouring an electric eel → gains paralytic toxin; devouring a fierce python → gains crushing strength; devouring dragon clan fragments → reverts to a dragon. From bottom-feeder in the river to urban spirit beast, then to overlord of national waters. Humans think I'm a mutated beast, wanting to hunt, research, and eliminate me. Little do they know, within me flows the blood of the dragon clan, inheriting the mission to fight against alien civilizations. — Description from novelcodex.org