God Won't Let Me Become an Immortal

In this world where one can cultivate to become an immortal, as long as one survives the final thunder tribulation of becoming an immortal, one can become an immortal. But a guy named Ling Tianxia has gone through nine lightning tribulations to become an immortal, but he is still a half-immortal, playing in the human world. But all this is not what Ling Tianxia wants! He really wants to become an immortal! ! But failure, failure, is failure...