this is a quote from the novel in later chapters. Han Yi-gyeol as I said, gets character development. He comes to terms that sacrificing himself, putting everyone else before him wasn't the only option. Maybe this was the result of his trauma that he became like this, but when he finally comfronted it, he realized he needed forget about it. Forget his past and focus on the future. Here's the quote, "I have long believed that in order to protect others, I had to bear everything on my own. That's the only way to protect them."

Cheon Sa-yeon would fully understand why I had no choice but to have such thoughts. Because he and I looked alike.

"But that wasn't the right answer... it was just I'm too arrogant."

"Don't call yourself arrogant."

"But that doesn't mean that everything that has happened so far is our fault. It would be arrogant to try to handle it alone."

"You sure are and I am. I was forced to endure while carrying a heavy burden. With a life that I couldn't protect while thinking that there was only one way."

plus he's a regressor and weary of repeating the same things over and over, so the MC acting differently this time is what piques his interest, much like SHJ's whole boredom shtick.

WHEN THE KISS HAPPENED WITH CSY I NEARLY CRIED OH MY GOD

1. A psychopath who apparently killed the sister of the original body that the MC has and who now takes the place of some kind of sugar daddy.

2. The protagonist of the novel that the MC read, quite similar to YJH from ORV.

3. A little punk with a younger brother / puppy vibe, who can't tell the difference between being a burden and healthily caring for MC (Although now his rank has risen, he doesn't seem to have a battle ability either)

4 and 5. We have the leader of the special squad and the secretary of the first ML, both hate each other, they are not very relevant and have not made great progress, but they show interest in MC

In the beginning he knew how the original Han Yi-gyeol acted around Cheon Sa-yeon but still decided to blow his cover acting a whole 180 which Cheon Sa-yeon can obviously see somethings weird.

The next one was advancing the novels plot by giving Ha Tae-heon an SS-rank item 3 months earlier. Now that would've been fine if it weren't for the fact he did not take caution to hide any of his tracks despite knowing he was being watched and under surveillance. AS WELL AS being all sus as f*ck not knowing how to explain how he knows this information. Besides just 'trust me'.

And lastly, the icing on the cake. He straight up told Ha Tae-heon that he'd meet a prophet in 3 months time and all he could explain why he knew was the same excuse 'trust me'.

There's just so many more situations like this that completely makes him so suspicious and it's only 50 chapters in.

I think this has been pointed out by the other reviewers, but the fact that MC just brushed off the matter ML killed the original body's sister is slightly bothering me. He might be acted cold or say hate toward that ML, but he still moans (lol?) when ML teased him and didn't refuse intimate interactions.
And yeah, one of the ML acts like a kid despite being a full grown ass man. I actually don't mind this kind of bratty ML and find them cute, but what irritates me is that he insists on following MC to the dangerous dungeons even though his ability is useless for fighting and instead become a burden. What a shame.
And what bothered me the most is his wind ability. This f*cking ability, they said it's powerful, yes I'm agree. BUT, I feel like his wind ability is just a plot device to be intimate with MLs. Even though the author says if S-rankers fight with MC assist, their fighting power becomes more effective (because they can fly I guess). Then logically, to alleviate their body & control their move is the one with wind ability (which is MC), right? But when fighting, MC is the one being carried/hugged instead. What a f*cking bullshit!

Imagine.. The angst & betrayal with the younger brother, his relationship with the cold-blooded daddy--I mean boss must be quite interesting to follow. *Cry*