ML just declared that he was cured, by MC's love, and that was the conclusion, his therapist hadn't been mentioned for half of the novel and really never came up again, ML simply went from having visual and auditory hallucinations, depression, severe dissociation, and potentially dangerous possessive tendencies to completely healed in the blink of an eye, without any kind of professional help.

Something I'm still very unsure about is, that several people stated ML to be a violent madman, they show genuine fear of being murdered, but we never hear about the reasons, even ML thinks MC would be afraid of him if he knew, yet it seems he never really did anything violent (???)

All we hear about is him cleaning up criminal family members, in the sense of sending them to jail. Either the writer has a strange fear of justice, or something doesn't add up.

I assume this is a plot point the author dropped in the middle of writing, it's another important matter that was left to die but still used every so often.

This is the same for the rebirth/premonition side-plot, it makes no sense whatsoever and adds nothing to the story apart from a villain so s*upid that it makes you wonder how they survived for so long.

family members or industry rivals

Family members (a cousin) try to break them up by badmouthing TingTing. ZhaoZhao beats them up, and they become amiable, and kinda terrified.

Another person has reincarnated. Things really don't end up well for them. Unlike the first person, who mostly ends up redeeming himself into a mostly likable character... this character's machinations screw him over.

More family members try to break them up, this time YanTing's... aunt, I think. ZhaoZhao ends the conflict in less than three chapters, and the aunt kind of redeems herself by telling YanTing of his boyfriend's loyalty to him.

ZHAOZHAO FINDS HIS BIOLOGICAL PARENTS!!! There's a genetic database that gets completed. His dad's a university professor, his mom's a well-liked opera star. Their child was taken by child traffickers, whose car then crashed into a river and they thought their kid was dead. (To be fair, they spent a LOT of effort trying to find him. And ZhaoZhao's dad was also unknowingly responsible for pulling his kid out of his abusive childhood by drawing light to the issue (if I read that part correctly). They form an amiable relationship first, and the biological relationship is foreshadowed. They are wonderful, wholesome people who also support ZhaoZhao and TingTing in their relationship.

MC was revealed to be an orphan. He was "adopted" by a family who abuses him. It was discovered by a school teacher and he was then put in a welfare home. Though he suffered, a lot of people helped him which made him see that the world is very kind.

For example, he knows Zhao Zhao has always wanted to find his parents (he's an orphan) and that's one of the reasons he's so active in the entertainment centre. He knows for ZZ, that's always been so important to him. Even though he's deathly afraid ZZ would leave him after he found his parents, he's still willing to invest huge sums of money to help ZZ achieve this dream.

in the beginning, there's a character who really dislikes him and makes him switch roles. Obviously he's also scheming against him and tries to make him fat by giving him bubble tea and sweets or something at night. Later on, the character asks the MC why did he help him even though he was so bad to him and MC just says it's true that he didn't like him, but all the food and tea he gave to him was real whether he did it with good or bad intentions. It doesn't matter what the character thinks of him or whatever because in mc's opinion he still helped him or something along those lines. So basically, it's not that he doesn't see the scheming or the negative emotions other have, but he chooses to move past it anyway.

he's actually quite pragmatic, recording conversations and pretending to be completely oblivious while taking care to protect himself

finding his parents so quickly (the same day he applies), which is probably every lost or abandoned child's dearest dream. Most of them search for years and years and might never find a clue. There were lots of very convenient coincidences, but it was tolerable, given this is a feel-good story.