There is magic, though? It's just that none of the girls have a fairy godmother to depend on. Or rather, they can get things done on their own?
(The magic I'm talking about came from the fairy godmother's son, who made it so NO ONE could swear when he got in trouble over cursing. There's probably more magic later on, but that was the biggest instance mentioned in the spoilers.)
...how in the world did you make THAT misunderstanding? Σ(  ̄□ ̄||)
Daniel, the ML, is the FAIRY GODMOTHER's son. As a child he used magic to remove swear words from the world. Mildred, the FL, is reincarnated into this world thinking that she's Cinderella's wicked stepmother, a belief that is supported by the lack of swearing in the world (since children's storybooks don't have swear words).
At NO POINT did I say Daniel was Mildred's child. That would make this the world's creepiest romance novel. (⊙…⊙ )
I don't think the fairy godmother has shown up yet. Cinderella has, though. (Cinderella is the Queen, if you missed it. Which is why she's also Daniel's godmother.)
So what that means is that Mildred missed the storybook by around 20 years. Cinderella, the Prince (King now), and the fairy godmother are all minor characters who just don't get much screen time. It's their kids' love story.
This storyline is twist in positive flow but what can I see I feel that Iris is actually a Cinderella coz her clothes was ruined but get more Beautiful after fixed it. This story not include magic so the reality should be like this. Is just the Iris position is different from Cinderella but her fate like a Cinderella story. Never we imagine that the prince need to disguise himself too