Started good and funny but devolved to a cheap and badly written Xianxia knock-off. In the first chapters of the story I thought it would be a good "Crackfic" which is fun and making of the Xianxia trope mixed with an absurdly overpowered system. This however quickly dissolved and the MC just became a wanderer type alchemist following all the cliches this trope has to offer, I honestly think the creativity of the author died. The whole thing needs a re-write, the start although creative and funny doesn't flow correctly and is not well written, author the book "Story Genius: How to Use Brain Science to Go Beyond Outlining and Write a Riveting Novel" is a good one on the subject. I would like to see more western comical elements, you gave him the memories of the one and only Rick Sanchez, that is completely absurd and could've made this whole work funnier if you employed some of his crazy characteristics, although memories does not equal personality and thinking patterns they should have had a gigantic change to the MC. The MC should've embraced more of Ricks mad scientist instead of nihilistic genius (since he got young ricks memories), so stuff like him releasing T-Virus equivalents to power up non-cultivators and other wacky stuff that would've made the whole plot more engaging. An over-arching plot-point would be nice, for example MC is in one of the lower realms that exist and in the end we find that the one who is managing/created the realms did so he can sacrifice the souls of people living there for power. However our MC does not care about that. Anyway, in conclusion your novel sparked my imagination but failed to deliver, a good fan-fiction that did something similar would be "You are Courting Death" but that one didn't have a crazy scientist. Overall if you re-write this I know you can do a lot better
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LIKEI hoped you would've continued the story because I really enjoy well done "crackfics" and the Xianxia genre in general is poorly represented in in this site. When you said that your MC didn't have character that's an astute observation, a lot of people tend to just give the character a goal and shape the character around that for example "I will be the most powerful in the world" cue edgy MC that tries to overtake resources from the sources original MC. I would start with Jung's archetypes and build a goal and the character from that.
is this a harem?