FL has the romantic desires of your average walnut but starts feeling mixed emotions seeing her childhood buddy suddenly spending more time with other characters than with her. For a lot of the plot it's more an attention thing than any jealousy, she genuinely just wants friendships with people, but it heads there over time. You can look forward to her having misunderstandings and feeling bad about MC's feelings and motivations for a time.

As the chapters progress the author starts stressing that her hanging out with guy friends while fake-dating was like a sin she committed, it gets heavy handed and kinda weird about it. Context doesn't matter, I guess?

Hah, actually guessed this one! It's not a game world, MC's awakened memories were actually future information was sent to him by an ascended FL to prevent him from dying. The information MC had about the 'game plot' was a stripped down contextualized version of what actually happened, and didn't indicate much of what FL was thinking throughout it, so MC only had part of the picture.

It turns out that when MC died she did not get over it. FL noticed the OG leads coming onto her and used their feelings, leading them on to get the resources and allies she needed to take revenge on the villain group that killed him. It's also hinted that she mu*dered the leads after the 'ending' once it came out that they were the ones who drove MC away, leading to his death, and then had the nerve to try to romance her. She eventually uses her broken powers send MC info and later some of her power in an effort to change things.

I will say, it was kinda sad how FLs personality shifted over time, in both timelines. No more happy and peppy character, just obsessive and guarded.

Take my advice, just stop when the numbered chapters end. I'd rather ignore the existence of most of the epilogue + afterwords, it becomes cringy harem comedy and the author decided to screw with the transmigration/memories plot twist. Did they forgot they had the whole memory thing wrapped up nicely, or something? Author suddenly decided they wanted MC to also have an extra set of memories on top of everything else, despite that new "twist" never playing an actual role before.

Except, the Heroine and the MC are just "fake lovers", and the MC acts as a deterrent for the other male students since the Heroine is considered an extreme beauty.

The character, that the MC takes over, only serves as a plot device that powers up the Heroine in the story. Other than that, he's supposed to get killed off to contribute to the Heroine's character growth.

The MC breaks up with the Heroine so she can get closer to the other Male Leads. Since if the MC stays as the Heroine's boyfriend, then the Male Leads won't be able to foster a close relationship with the Heroine. (They'll be deterred at the fact that she has a boyfriend)

Which is important so that the Heroine gains the Male Leads as allies, just like in the original plot.

But the Heroine still has lingering feelings, since both her and the MC have spent a lot of time together as a fake couple.

But she isn't aware of her own feelings yet, and so she just harbors a small jealousy towards the Villainess who has teamed up with the MC.

As a test of character, a professor (forgot their name) shows their bloodlust towards the students.

The MC resists the intimidation, and casually looks over the frightened students who are struggling against the professor's bloodlust.

The professor takes note of this, and becomes interested in the MC's capabilities as a commander. (Since he has a calm demeanor, and possesses a tactical mind. Despite being weak.)

The MC's strategies PERFECTLY go as planned. To the point where the Villainess (who teamed up with the MC) questions if the MC has precognitive abilities.

Although, the Villainess and her lackey get all the spotlight. Since the MC lacks the combative abilities to contribute to the team. (But the MC comes up with the plans)