Ok, the first arc, there's this one dude who is the cousin of the ML who wants to ruin the MC because he's friends with the MC's enemy half brother. First of all, he continues to think the MC's half brother is righteous and poor, when if he's anything like his background suggests he should know very well how wrong that is even if he is a spoiled rich master. He's a spoiled rich master, not brainless.

Second of all, while the first reason should already have been a deterrent from him helping the MC's half brother, most importantly his cousin, who he relies on to throw his weight around (he's the thigh he grips basically) is the ML, and already warns him once before that if he dares throw his weight around with his name again he'll break his leg. Now, obviously this could be taken as a fake threat, but then the cousin is proven that the threat is real when he tries to mess with the MC and the ML very nearly beats him up before letting the MC beat the cousin up with a bloody rolling pin. Yet, even with his thigh taken away and given to someone else, this idiot still thinks that he can mess with the MC, and tries to cause him to crash his car. Obviously this doesn't work, and the ML quickly finds out that it was the cousin did it and ruins his legs while also sending his entire family to another country.

If it were you, spoiled, hugging the big thigh and enjoying life as a rich wastrel (which the cousin should not completely be as the successor to his family's company, he might be little reckless and arrogant, but not to this extent, another thing wrong with him), if your thigh was taken away and on the other person's side, and even showed you through violent force that they were on your enemy's side, would you still try to ruin your enemy?

Would you still stand with the "friend" that is friends with you because of your status and because you like their skills (cooking in this case, for some reason the cousin calls the MC's Half bro as his very close friend and it's like the author is making sure the cousin is some dumb idiot cannon fodder without any subtly whatsoever) ? Not to mention that this already flaky and shady friend already has hella questionable family issues with the MC and the MC seems to be in the right (from what the MC released as evidence at the time already called a lot of his slag family's issues into public so he should have be at least suspicious already)

If it were me, hell no. No matter how spoiled, rich, or pigheaded I may be in this scenario, who would want to support this fake friend who only wants my backing who also seems to be quite in the wrong, not to mention the big thigh I always had is gone and is supporting the other side! If this is my thigh over there, obviously I also follow to keep holding onto to this big thigh! Again, spoiled, rich, and pigheaded the cousin may be, he still has a working brain ok?

in the first arc it was incredibly disappointing how their romance progressed. There was very little contact between the two, there was the first meeting, like one instance where the ML asks the MC to eat with him (and that's when he realizes he's in love), then after that no contact other than remotely sending over flowers daily and then bam, making out and s*x. At least in other OP MC with system novels they have the ML hang around the MC like a leech to make sure it makes sense the MC falls for the ML despite not knowing if it's the ML and not being with anyone else previously. But here it's just, oh yeah, the MC has never been in a relationship for over a thousand lifetimes, but suddenly sees the ML who he didn't know was the ML, and instantly is like "Hey, deja vu, it's like I know this man. Let's have some half hearted wooing and fall into his bed right after because it feels familiar." Later on in the novel it explains that they were originally already a couple, which is how they already seemed familiar with each other. But also, the romance is so lacking!! The shamelessness and sexy times keep going faster with every arc though, like by the tenth arc or something the MC is almost immediately naked in the ML's bed (in a nons*xual manner in the beginning at least since the ML was painting him but still), but also tofu was eaten like right then and there and then so many more times within the arc... without any trouble finding the ML and no romance building at all whatsoever... mmm okay then.

other characters aside from the MC have retained some sort of memories from past lives and that it's possible that more than just JY's soul is reincarnating...

double taboo daddy x cheeky godling prince - Shang Wang x Jing Yang

"Shang Wang was the ancient god of war, a few generations older than (Jing Yang's father) the Heavenly Emperor... Shang Wang himself had no children and it was also the first time he helped others to raise children. He originally thought that as long as the child grew up well, he would not have failed the entrustment of the Heavenly Emperor, but he watched that little person grow up little by little with his own eyes. In the process of getting along, actually a different feeling emerged between them... unknowingly, he raised a little lover who was spoiled by him" (¬_¬)

Is this whole book's conflict due to JY and SW having freaky roleplay times? Sure, yeah. But it's also due to Bian Qing (the antagonist) being the original nosy jealous bit*h and sabotaging the reincarnations, so all the cruelty and suffering we just read about is deserved (mostly).

the antagonist was also doomed to play out–ironically–a cannon fodder role himself

Shang Wang

Also, in arc 2, there's a scene where the ML forced himself to the MC, halfway through the MC realized it is ML (ML doesn't remember MC or his identity in the previous world, so MC has to guess in new world who ML is, but there's not much difficulty) so he allows him to papapa him. Still, it was a 100% r*pe attempt. So be careful if you have triggers. I have added a 'rape' tag to the novel info and also requested additional dubious consent tag, in case the R tag is pulled down, still, Be safe :)