
I do not understand why this trope is so popular.
You cannot raise a child and then fuck them. This is grooming nonsense. You cannot raise a child, change their gender into the perfect gender for you to fuck, and then fuck them.
If you live next door to a 12-year-old you cannot interact with them daily, ingratiate yourself into their lives, give them presents, make them like you as an authority figure, and then fuck them! That's grooming. It's grooming even if you wait until they're 18.
Using your developed adult brain and position of authority as an older person to raise a child and your perfect little fucktoy is grooming.
The main character of this manhwa is a disgusting degenerate groomer. The point of this manhwa is to show you how positive and great grooming is, it's to make you see the world from the point of view of a groomer, it's too normalize grooming.