Only concept taken from webtoon. 

 Someone:

how much different?which story looks better to you between drama and webtoon?

Webtoon. It's so much better than the drama. I hate how they change the plot like entirely from webtoon, considering this was such a highly anticipated adaptation since a long time ago.

 AbuHammer:

I know, this drama is so disappointing and them casting a rapist pedo makes it even worse 

Who is the rapist pedo?

 Fefe:

Who is the rapist pedo?

The actor who played Do-ha's stepfather. i forgot his name