This review is after reading the first 50 chapters during the trial period. All I can say is - this novel is extremely boring.
First off, let me state that I'm not a big fan of Sign In novels. I've always found them to be a really boring type of system, copied from some of the worst free-to-play games. However, I went into this novel with an open mind, willing to give it a chance.
The main problem with this novel isn't the Sign In system, but just that it's so incredibly boring. It's written more like a documentary about the life of an immortal, rather than a story of the events around the hero.
The author has no sense of how to create tension or suspense in any scene. The MC is an almost emotionless doll that never reacts to anything around him, he's always lost in his own world. Even on the rare occasions that he gets into a fight, he has an utterly deadpan personality, and it feels like I'm seeing the author write about a walking piece of tofu rather than a human being. The fight scenes aren't completely worthless, as the MC uses a silly fighting style similar to One Punch Man, where he kills everything with a single punch, but even that just feels boring because there's no strategy to the fights. The fights get over before they've even begun, and most of the time the MC doesn't even know why the fight happened in the first place, because he's such a boring blob of tofu that he doesn't care to find out.
Another serious problem with this novel is how it tries to badly ramp up the drama through scenes where the MC does an "amazing" task in front of other disciples of his sect. The problem is that the author has no idea what's actually impressive to look at through the eyes of a reader. For example, he spends several chapters talking about how "the MC dared to take one more step" in order to obtain treasures or walk on a lake, all while a crowd of background characters keeps shouting out how absolutely amazing it is that the MC can keep taking that step. It feels very artificial and forced, to the point that I want to puke just thinking about it.
On the positive side, because the MC is so utterly bland, some of the side characters appear more relatable. There's a female character, a senior sister, who's actually wiling to listen to the MC's advice and words, and there's a senior brother who takes him seriously and accepts him as a rival on the path of cultivation. The problem is just that they're still incredibly shallow, up to the point I've seen. Rather than have independent personalities of their own, they feel like they were specially constructed characters created just to make the MC look better.
The story tries to show us that even for a genius MC, it still takes hundreds of years to walk down the path of immortal cuktivation. While that's a nice mindset to have, the problem is when there's nothing at all happening during all those hundreds of years.
TL DR : It's a boring story about an unexpressive MC doing nothing but cultivating for hundreds of years.