At one point, our Sis-con MC has a chance to grab beauty enhancing drugs for his sister that would also make her more physically capable, but passes it up because he's in a rush somehow. He is also very tightfisted with his money, being very reluctant to purchase from the dungeon shopkeeper caring for him and some 4000 others. It's dumbfounding she of them fell for him (when he had a very poor charm stat no less). It's odd he's so tightfisted since his father was making enough throughout his son's life to support their family very well.

The princess' reason is magical foresight. Pretty weak as even at the point I quit reading they know almost nothing about eachother. And she's pretty much the first 'love interest' he meets, though she doesn't come into the story properly till probably around chapter 80.

With each world under threat from some form of monster or demon race and the dungeon explorers the only ones who can effectively combat that threat it becomes extra unbelievable.

Yes, clearing five floors of the dungeon in seven hours would have been impressive. If the mobs could have damaged the MC... or even hit them without his explicit consent.

First of all, we start with a fresh beginning with the dungeon system that we all know and love with some minor differences. Nothing new but a working formula, it was alright but nothing amazing. Then the novel becomes a rinse & repeat.

That's minus points but it doesn't fail the novel. After all it can still be good with a repeated formula, only 1 problem which is the fact that the author decides not to create a sense of danger/urgency/.... (feeling that gets the reader running some adrenaline), basically from reading chapter 5 I knew what would happen in chapter 50 since he doesn't change anything. He adds new components to the story but never decides to have someone die/MC lose/ MC in any proper danger.

And the worst problem of the story, the ladies. Their function is to fall in love with yer boi MC. I think its like 5/6 people who have fallen for him already in a bit more than 100 chapters. There isn't even any plot or reasons for it, just the author tells us how the "Hero" of a world has much higher charm than other people to hide his plothole which is the fact that all the girls, no matter their age, are all pure and never been in a relationship/or off a relationship for 1000's of years like that Lorretta bit*h but the second the MC appears and says hi, they want to climb into his bed. Forget your personality/ feelings, this guy has high charm so you will fall for him in 1 chapter of meeting him.

a 12 year old girl from a wealthy family is let out of the house wearing a see-through dress (she's blind and in a wheelchair, so you can't just say "well, it's her choice" no, she also has bodyguards following her so they all accompany this little girl in a wheelchair wearing this see-through dress and it's just creepy) and then she's left alone in a room with an adult man on top of that.

and thus he receive those pots while potato witch doesn't.

but after the dimensional mercenary arc thing, he decides to become stronger so that he could live without relying on others.

MC train and go to dungeon to achieve his and his father dream of mana -> MC learns the truth that he is a hero which shouldn't die -> MC hates it because he feels that people look at his achievement because he is a hero and not vice versa -> MC hates it because some one suggest that he should sacrifice others and he must hide so he don't die-> MC trains even harder so those won't happen.

The story in ICDS follows Kang Shin, who starts out as a teenager on Earth without many abilities, but throughout the story becomes stronger and stronger at a rapid pace. He powers up primarily through dungeon crawling, while getting some benefits from fighting the enemies invading Earth. He's basically the stereotypical hero, who seems to grow from naive and mana-less, to mature, decisive, and overpowered. For the first part of the story, his struggle to grow and the clear distinction between his power and his enemies' power was interesting. Then, he began to grow to the point where no fight had tension anymore. Even though he went in thinking "I might die" or "I was tense", there was no real trouble or possibility of him dying. It's incredibly repetitive, and the loop of dungeon -> Earth -> dungeon becomes quite boring, but most of the fights are pretty descriptive and intricate, even if the ending seems like it came out of nowhere.

The plot itself is standard to this kind of story. Monsters are invading Earth, and Earth isn't the only world that's being attacked. The way to level up is to go through the dungeon, and to defeat the attackers that come into someone's home world. There are a variety of abilities, items, and enemies, so even though they're not all that unique, the quantity keeps anything from being boring or overused. That being said, the explanation for how and why everything happens, and the ending in itself, is incredibly forced and done just to continuously keep the reader guessing, rather than having something that is logical and makes sense.

To add to this, the author withholds information in parts of the story which are relevant to what's happening. Since the story is told from the MC's perspective, it's incredibly weird for him to somehow say "it was all part of my plan" several chapters after. It's not an unreliable narrator, it's simply poor storytelling. There are "clues" to figure out how it all happened, but it's a pointless endeavor anyway: why try to be secretive with the reader when even the MC knows what's going on?

The side characters are pretty one-dimensional and generally aren't that useful in the big fights anyway. The harem of women that the main character gathers constantly ruins any kind of tension or suspense that may be built. In fact, the way the characters (including Shin) act is very childish and annoying, and the dialogue is incredibly basic and filled with "witty" quips. It's a very stereotypical type of dialogue and character portrayal from what I've seen in Korean novels, and there's nothing special here.

The story starts with MC entering a dungeon (just for sake of it: dungeon = place filled with monsters and bosses. When defeated MC is strengthen gets items, skills and spells.). Before story hits chapter 10 though, the earth experiences the change and monsters and such start appearing in real world, at the same time people with super powers start appear as well. Unlike most idiotic MCs that would go out to save the world, our MC decides to stay at home and level up in dungeon as unlike in real world, in dungeon he is immortal (even if he dies he just needs to wait a week for re-spawn). In any case for few years MC is just doing his missions and interacts with people from other worlds in dungeons with absolute zero care about what happens on earth. At this point the number of potential heroines is 3 so it's not too bad.

Still suddenly the story takes shift. For absolutely no reason what so ever, MC suddenly becomes a hero... not by doing anything mind you but rather by ignoring the world and doing his levelling up. He didn't save anyone, nor did he defeat the big bad boss, no he simply got few achievements and grinned his stats but suddenly the author decided to label him as a "HERO". Soon after, yet again author changes MC and MC suddenly has misgivings about helping people and saving them from dying... worst part of all without any warning before I even noticed MC became a generic dense protagonist that wants to save the world... sigh, where did MC that had zero care about world's problems and just wanted to earn money went to? Putting those two together it's really like two different MCs and two different stories all together.