
Like seeing a character who transmigrate into an otome but the action are somewhat relatable, like duh if we readers go into the storyline we would love to be the bystander and might be the guardian of everyone especially for our bias and shipping our cp's would be more our accurate action reactions.

He already has a constellation right, the one with blonde hair holding a book

He wants a different constellation because his old one practically did nothing for him..
He was thankful for being chosen, but in order to reap the benefits of his constellation, he had to keep rising his level and he could never reach that specific level. The regression was the last gift his constellation gave him, and besides not being able to choose who appears infront of him, why would he pick a constellation that benefitted him very little for close to 25 years over a luck constellation that's helped him gain 100 times more fortune than his last one. Besides, his old constellation probably won't appear because he is no longer considered a late bloomer.

It's still suspicious, maybe swan knows that she's not the real one, that's why she's making sure before she died that mc will be the one to go

I think that's the theory in the novel too, because the holy power is the only reason for Swan's existence. Because she's supposed to be dead not long after she came to orphanage.
And because the holy power came from Lilian's mom, it influenced her appearance, and her attitude too because of the foresight power she gain. But it's not that strong, so she's only get a bit sight surrounding her own death.

Doctor: "patient? Would you like to try drinking this cure-all-drug for your cancer instead of chemotherapy?"
Patient: "would that cure my cancer?"
Doctor: "of course, but you have to sign this waver with the contents of [not asking what the ingredients, if you ever found out the ingredients make sure not to be disgusted] and we will provide you the cure-all-drug for your cancer"
Patient: "ok doctor, I will sign it"
My face was literally in scowl like wtf?! Let me just punch this motherFace, for real dude you were drawn to be handsome Seme but you looking pretty ugly to me right now, not gonna lie, I hate how oblivious he is for Dan's suffering from him