* Retconning all the time. The author, 60 chapters ago, had said "the condition to become a hidden class would change, that's why people couldn't become X class even though they did the exact same thing: someone needed to do Y and Z, and another person had to do J and K, to become X class". Then Sehee (MC's sister) becomes growth-type hidden class, Saintess, at level 1 after saving an NPC on her FIRST DAY. Then the author says that saving an NPC was the condition to become a 'Saintess'. Sehee became a Saintess on her first day, while over 2 billion players didn't save any NPCs in over 2 years? Yet the author has the GALL to say that the class conditions were to save an NPC? This was the retcon that ruined the WN for me. Stop retconning your stupid crap, it went from 'billions of people watching MC fight' to 'hundreds of millions of people watching MC fight', from Ch. 100 to Ch .175, and that was a GOOD RETCON because the numbers made a lot more sense. This is a TERRIBLE RETCON when you change the conditions just to suit the needs of the MC.
* The capsule machine costs 10 million won (roughly $USD 8000). That wouldn't even cover the cost of materials for such a large machine, let alone cost of production, R&D, et cetera. That is so retarded. We know it's the year 20XX, so it's not even the 22nd century yet. Therefore, it is useless to say that humanity has discovered asteroid mining and achieved post-scarcity economy globally. That won't be done in the next 79 years from now, that would be more like 179 years.
* Fantasy creatures are way too small in the manhwa: 'Ancient Weapon' golems are 8 meters tall, and drakes are as large as a real life draft horse. You'd expect these powerful beasts to be two to three times their size.
* It is incoherent because "over 2 billion people play this game", but there are only 17 kingdoms. That means over 117 million players for every kingdom (let's say there are neutral factions who are not kingdoms, reduce it to 100 million each), but a decent-sized city has 70 thousand people? It should be bustling with players 20 size that number plus 1:4 ratio of NPCs. That makes absolutely no sense. If over 2 billion users play the game, then the world-building should be intricate enough to accomodate 2 billion players PLUS at least just as many NPCs and monsters. That means over 6 billion characters at bare minimum, yet the author's world is TINY compared to the amount of people supposedly playing this game (plus the NPCs who should outnumber them by a good amount because 1:1 ratio of NPCs to players doesn't sound like a good fantasy setting).
* The author describes every girl as 'white' or 'milky white'. I understand the author has a white girl fetish, but Jesus H. Christ. It gets mundane after 30 times of describing every single female character (besides Jishuka) as 'white'. This is not an exaggeration.
* Blatant South Korean patriotism. It goes from 'I am a reserve soldier, I did my military service for my country' to 'I became the hero of South Korea by defeating baddie Yankees who tore the South Korean flag!'
* Every single male character besides the plot-relevant male characters (guildmates, rival guild characters, NPCs) are there to sexualize the girls around MC. They sexualize his friends, sister, sister's friend, and even female NPCs around him... This is ridiculous, if you're not a male relevant to the plot, then you just want to get your dick wet.
* He should ease up on the cliché lines such as, "this moment would shake the whole world", "their story would go down in history", "they would be the ones to rule the world", etc. It keeps destroying our expectations so early. He has done this about 15-20 times until Chapter 203. A story where you know the end is not a fun story at all, unless you're talking about Ancient Greek works, dramatic irony, and you're there for catharsis. Stop telling us the end of the story: "they would go down in history books." "this moment would become legendary forever." SO. FUCKING. STUPID. CH. 200 is not even 1/5th of the NOVEL.