i actually read the first 60 chapters of the webtoon a few months back when i found out about it being adapted into a drama. They changed a few things [like the first meeting of jugyeong and suho, jugyeongs family situation] but overall its been very true to the webtoon and i genuinely enjoyed the first ep. Moon ga-young plays jugyeongs character wonderfully, eun woo on the other hand doesn't really show a lot of expressions, i'm hoping thats him staying true to suhos character of being the quite introverted kid.