IN SO MUCH WAYS. Like how Iona and Theo are like siblings, real close like frenemies but they're definitely not interested in one another like shown in the manhwa. Maril wasn't also involved with Skaram. The white dragon was only mentioned when Grid was being scolded for failing his mission in feeding the locusts. The frog Gaeron was only a soul and like he was summoned and wasn't already an entity. The whole story is messed up. They're like two different stories now. Regarding the feeding of locusts, Tariq was caught by the necklace that Iona has and the kidnapping scene nevee happened. The princess rabbit was actually caught by Skaram and she was put in the bag. Then Theo's paws were attracted to his bag because of the red ribbon on her head which is actually an artifact. Theo has a golden paw which should've been emphasized, he had this power where he gets attracted with anything that's OP or like an artifact. So they brought Skaram and the princess rabbit and that's when the black rabbit fell in love at first sight. As you can see, it's really really different, like they redid the whole story...
GOSH yeah it's one of the most frustrating things because in the novel, their romance is actually like an extra thing but it's very very sincere. Aileen has a crush on Sejun and it's late when Sejun realizes that he likes Aileen. So not until later chapters was the real romance. Readers are like given this tacit understanding instead. Although there was no real 'romance' yet, we can see that because Aileen was part of Sejun's survival, there's a reason that she became special to him.
Also, unlike the manhwa, Aileen knows the boundaries... and is quite immature but mature at the same time. Considering that she's a sheltered dragon, it's actually understandable but it's not annoying in the novel compared to the manhwa... Basically, the characters in the novel and manhwa seems to have different personalities lol, the manhwa didn't get their original essence, especially Theo.... I honestly think they made them less annoying? Because I heard from other readers that Theo and Cuengi(crimson bear) are kinda annoying for always bugging mc but I think there's a reason for it and it's kind of their personality that got built because of MC's care lol. Like how Theo believes in Sejun so much to the point that if he thinks about Sejun while fighting, he becomes super OP. While Cuengi was basically spoiled by MC because he was cute, but they of course have boundaries and aren't that annoying in my opinion.
Well, yea, technically they would be in a relationship but what I mean is that, not until like hundreds of chapters or so or even late did Iona and Theo's relationship seems formal in the novel. In like a hundred chapters, they were still bickering and frenemies. In 200+ chapters, Iona suddenly says stuffs like "How dare you try to make me introduce you to another woman?!" When Theo asked her to introduce her to Mymir because she used a potion nullification to nullify the forced contract Theo made when when she fainted from Cuengi. But like, the novel only showed that they seemed more closer than before. So it kinds of bug me that the artists from the manhwa is creating this already present moment where Iona and Theo is already close, Sejun and Aileen are flirting with no reason... and not showing the characters developments that the author made. I mean, it was so fascinating to see how their relationships with one another grow. So the Manhwa is like forced to fast forward and it's scrambled.
Youve made me really want to check out the novel but also now the direction of the web comic makes way more sense. Ive noticed with any comic style adaptation from a novel they're forced to change things and add visual details that help the reading make sense of things. You can really stretch things out and take your time to explain things in a novel but you gotta get creative to deliver the same info with mostly pictures and that seems to be what's happening here. The web comic is just skipping the fluff and getting straight to the main meal.

I tell you, the manhwa has gone far astray to the novel. These two are now like two different stories.... it got worst the moment they met Iona and every little thing strayed far from the original story.