I have read the webtoon before watching the drama, there are some differences between the two in some details of the story, but for the first time in the webtoon adaptation history the drama was better than webtoon mainly because I found myself emotionally invested in it also the acting was so good that it made me cry in some sense.
another reason why I found it better:
ji-soo is not the love interest of hyun-soo, I mean she is cute and everything but he is a minor and she is not so it was kinda weird in the webtoon
the only reason why I couldn't give it a higher rating was because of CGI I think it wasn't the best.