Spoiler***
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Mc was a cat demon (yao guai or in Japanese- youkai) he was picked up by the ML on his trip to the human realm.
Ml is the Heavenly Emperor, and they were forced to separate because ML mistakenly thought that MC was a possible threat. But he already liked MC so much that instead of killing him, he sent him to the demonic realm for the YaoGuais/Youkais . The only way MC can ever meet ML again is if he were to cultivate to become a god. So he did. When he finished cultivation in the demonic realm, he needed to succeed in 3 trials. Each trial was to reincarnate as a human and suffer 3 separate "hardships" in each life.
MC forgo the last trial because he thought that ML never loved him/incapable of love.
So he went back into the reincarnation loop and forgo all his memories and efforts.
Then some more heart-wrenching stuff. But ML did truly fell in love with MC. He gave MC part of his powers which let MC become a god in the start of the story. He gave MC part of his power despite the possibility of dying and losing his godship(?).
Damn this is amazingly complex! Found a new favorite! And can't wait to read all of it! ヾ(☆▽☆)
I cried a little bit after finish the manhua. Some people might not understand the plot so I will summarize it. The male lead and the mc know each other back then before the whole 'treating the male lead' situation. The mc want to be together with the male lead and doesn't want him to be lonely because the male lead took care the mc as cat before. So he wanted to be god ( Im not sure what word to use but it might be the same position with the male lead) and he reincarnated into other world as a trial (I guess).
Well, the male lead also follow the mc reincarnated with his memory intacted and they live quite well in the first life but the problem came in their second life. Still remember that shady doctor, yeah he is a bitch. Basically misunderstanding happened between the male lead and the mc. Mc feel betrayed and decided to forget everything. And here we are. At least they get happy ending.