Read up to chapter 19, and can solidly say that it looks visually really good, but the writing sucks hard(in the way that it feels like it was written by an unironic edge lord who thinks everyone who isn't a scumbag is an idiot, and so has his MC constantly inner monologuing exactly that while the other characters act so dumb and/or evil that it outright creates holes and flaws in the actual story).
If you want a similar premise but written better, I'd recommend "Revenge of the Sword Clan's Hound" or "The Villainess reverses the hourglass", with the former essentially being "this, but with good writing", and the latter being a Shoujo with less action, but a very smart MC that doesn't pull punches in her revenge scheme.

https://i.postimg.cc/jdFLsMmX/i.jpg
Dude must've been an Xbox fan.

Feel like this fits
https://i.postimg.cc/QdLYcQSV/i.jpg

As of chapter 61, it's... passable? Like, the comedy is alright, and the writing is just bad, but inoffensive. It's the manhwa equivalent of subpar fast food that you don't like, but it's not gross enough to throw away, plus you paid for it and ARE hungry, so you eat it, but just for the sake of having consumed something and not wasting money.
The plot is that the MC is the child of an "immortal"(people with super healing and heightened senses, but are physically weak) and a "shapeshifter"(people with super strength and agility, but basically lack the things "immortals" have). Essentially, it's not considered possible to be the child of both, so MC is an irregularity trying to hide that he's got both, because he'd probably be experimented on if it was found out.
Interesting plot, right? Well guess what? None of that actually matters. Why? Because shortly after the training arc, we see pretty much all the "immortals" are just as strong and fast as MC because "reasons", and that shapeshifters can naturally heal & get medical attention that is comparable to the "immortals" healing factor. So basically, it's actually just a plot about MC basically being an errand boy wherever he goes in a company that honestly sucks, and everyone treats MC like shit but MC still hangs around them and doesn't just quit because "reasons".
So, read if you want, but don't go in with super high expectations.

I do kind of hope he actually does try going back into acting. Him as full time helper is great, but it feels like we need to see him in a position where the other 3 are supporting him achieve stuff, like he supports them.

So heads up.
MC is likable enough, but a lot of the side characters are kind of garbage and the series gives a LOT of attention to them. It's not even the usual "mc reincarnated into someone who was scummy" thing. It's just that the love interest is a thot who thought of him as lesser, and started chasing after someone else.
Fortunately, MC isn't a simp which alleviates a lot of issues for now, but it's very much a "one step away from being good and one step away from being crap" situation, depending on how MC handles the other characters.

You might want to add more context to your spoiler warning because I was just referring to the first chapter, whereas yours is a major spoiler that even the current chapters haven't begun to hint at yet.

It's a combination of 2 popular genres, and so far it's specifically "alright". The art is great, the system behind her powers is somewhat creative despite it being 60% the standard "appraisal" invisible stats that only MC can see, and the concept is actually quite original.
The problem is that it immediately jumps into probably the worst cliches of both genres almost instantly and Unfortunately those are the only things driving the story ATM.
Those being "MC is only considered a villain because they were horribly wronged but everyone is an asshole and sides with the actual villains, immediately assumes they're lying, and therefore treats MC horribly due to their own assumptions, and it'll all probably be brushed over with not nearly enough consequences for their actions after MC just temporarily acts standoff-ish for a couple of chapters" and "MC is ridiculously OP, has more than enough reason to kill/beat up her enemies, supposedly has a history of doing specifically that in the events before the actual story and it would seemingly solve all her known issues, but they don't because that would make the story short without all the contrived BS of MC not directly dealing with the people openly trying to make her life miserable".
Honestly, if those things don't bother you, you'll probably enjoy it, I was just pretty annoyed with how things mainly went in the first 11 chapters personally. But that's just me.

So, spoiler for the first chapter, but also to give a little more context:
MC's friend(the hero) is gay and a Yandere, and secretly killed everyone that would potentially get close to MC. The hero dies, so MC gets sent back to the beginning where he plans to kill the hero and take his place. The harem is basically just all the people the hero killed in the first run.

Honestly, it's a pretty great series as of chapter 18, and I genuinely wasn't expecting to see the MC handle the situations as well as he does. On top of that, the harem aspect is more of a secondary thing of MC just being kind to characters that are already wholesome(which makes their deaths in the first run even sadder).

So, are they just not going to address that the prince also tried to murder his opponent while their back was turned after losing the dual to them?
Like yeah, MC is a commoner. But it was still a public event, and MC is pretty famous as an asset to the kingdom. On top of that, now the MC has complete justification to directly be against the royal family while again, being a a notably powerful individual that other families are already trying to bring into their own militaries.

I can't wait to see the reactions everyone on the outside has.

So, heads up.
It's an interesting premise and has promise, but it's told in a really crap way in the first 2 chapters.
What I mean is that it starts with a young MC, and MC starts telling a story to his students, and it jump cuts to MC as an old man as if it was in the past, but it's actually the future, and older MC starts thinking about something bad that happened to the students in the past, which implies that it happened after the initial part of the story which was set in the past where the students were okay, but it's actually before that part, and another character points out that he literally solved the thing he's regretting and was happy in the first part, which happened after the third part, so it literally makes no sense why he's so down.

Basically, the story will be potentially great once the author gets his shit together. Hopefully that can happen in chapter 3, so that new readers can just skip them and get a cliff note version.

Read up to 26. And yeah, It sucks.
Firstly, the description is wrong. He didn't travel into the past, he traveled to the future.
Secondly, the series works on nonexistent logic. The teachers are against rule breaking until they aren't. They're all D-bags who punch a small child for being distracted, until they aren't. MC is weak until he isn't(but don't worry. He didn't have to work for it), and his logic for not telling the people that he's the legendary figure from the past and has super crucial information on their enemies is because "It'd be a hassle, and they might not believe me."That's the savior of humanity guys. He doesn't even evolve! He just steals specific powers from the demons he kills.
And I know the other comments say it gets better, but I honestly just didn't feel any investment in the characters or the world. So I'd give this a pass personally.

I think it's because even if they couldn't have succeeded, they still officially failed miserably against kids. So if he let them go despite failing, it'd look like he was being weak by allowing excuses to justify failure, on top of these people potentially gaining resentment as a result of this incident(whether it's towards Helmut for making them fail, or towards the organization that sent them on an unreasonably difficult mission disguised as an easy one).
So getting rid of them wasn't because he didn't understand, but because he was trying to prevent any fallout from their failure.

Summary:It's like the Wish.com version of Wise man's grandchild, with a ripped off speedrun of the piggy duke premise.
Art isn't bad, but kind of bare bones in every other department.
That being said, the "rival" is just pure bad writing. Like, this child is just the most cliche brat character, but also openly commits crimes against the most important people in this world(including attempted murder) and should've logically been publicly executed twice as of chapter 13. And it's not even like the series makes it look like he gets away with it. The dude gets caught, everyone calls him an asshole, and then everyone just forgets what he did.

Worthless regression

...https://i.postimg.cc/tTZsbksL/i.jpg

So, now MC personally has the skill to nullify 99.9% of damage he takes. Right?

You dont seem to get it, so let me ask this. How much is your life worth? Let's say I rescue you from a burning building and save you, and now you owe me. What can you do to ever repay me? Saving my life is most likely never going to happen, so how would you ever repay me for what I did? Nothing you have to offer me is useful, but I literally saved your life. Sure, I may say I don't care, but literally every moment of your existence, every breath you take is a result of me going out of my way to help you. What could you possibly do to return that favor to me? What amount of money is worth your entire future?

The problem is that your version of kindness is unreasonably cruel at times.
Having an unpayable debt(especially out of charity) to someone weighs heavily on the mind and creates feelings of failure and insecurity(which DOES lead to suicide occasionally).
Whereas having a debt that you HAVE to pay back gives motivation to work hard, and get back on their feet. So it's almost like getting a second chance.
The problem is that you're looking at it very very very surface level, which kind of makes it into the "give a man to fish vs. Teach a man to fish" scenario.