Turns out his daoist brother and his wife that is mentioned on the title are reincarnated immortals. The guy died and MC hooked up. with that woman.. Lol

The speed at which the MC gathers women really accelerates and by the end of the novel you're looking at dozens. There's not much lead-up for any of them falling into his clutches and the few women that do get screen-time are still very poorly developed personality-wise. Note that all of the juicy stuff happens off-screen, and it can be very ambiguous sometimes if he actually slept with someone. (In hindsight, yes, he sleeps with everyone.) This is actually fairly disturbing because some of the people he goes around sleeping with are his adopted daughters and their mothers. Just a warning.

Things go downhill before chapter 300 when the titular character (the fellow daoist's wife that the MC took in) ends up suddenly regaining the personality of a past life in which they were an immortal with a daoist partner. She attacks the MC, angry about what he's done to her, and then she runs off to find her partner's reincarnation, eventually taking a passage to the upper world. Later the MC goes to the upper world as well, which requires him to abandon most of his family for a couple of thousand years. There's more of the same collecting and whatnot in the upper world, but jumping to the end: the woman that ran away returns to the MC as an immortal far stronger than him. Rather than getting the revenge the MC has been afraid of for a hundred chapters though, it turns out that the woman's partner failed in their cultivation and had their sould dissipate, so they've decided to give the body back to the old personality. The MC and all the people with him in the upper world, including the returned woman, then go back to the lower world and reunite with the people they abandoned.