Yuan Long

Special forces operative Wang Sheng was transported into the world of Yuanhun. There, he was possessed by a useless spirit: a carp, becoming an infamous trash in the world of Origin Spirits! In this world filled with experts, Wang Sheng used the knowledge he acquires to surmount all difficulties, even finding a way to evolve his useless spirit carp! From a sparrow to a Phoenix, from a carp to a Dragon! In this sinister and vicious world full of disputes, he will make his own path towards success!
(Source: Bilibili, translated)
Note: Includes three extra chapters.