
I'm confused... Was the movie based on the webtoon, or the webtoon based on the movie?

Because translations are posted here recently but the original webtoon has been out since 2010. you can google for more https://www.mangaupdates.com/series.html?id=60497
https://en.wikipedia.org/wiki/Secretly,_Greatly

The art is pretty, I thought it was such a blessing to find this manga. But that end chapter really ruined it all...
Man... I tried to imagine every possible way of how this wouldn't turned into pedo trope or child grooming, but my mind just went blank.
He already knows what sex is for he already experienced it when he was a ghost. Although he might not yet know the exact term is 'sex'. He'll for sure will ask to do something 'naughty' again. Arghh, is it even right to call this child grooming though?? I mean, the child is the one who kinda ask for a fuck, the adult was actually the one who was coerced into it-- I can't---
My chest was so heavy with emotion, and I want to cry too... But my parents are right next to me!!! (╯°Д °)╯╧╧