I may be too late, but in my opinion: you can watch the kdrama and read the webtoon after that - you won't spoil anything, it would be like to different stories. But if you read the manhwa first, I doubt you will be able to watch the drama without constantly comparing it.
From a not manhwa reader, the kdrama is good and made me search for the manhwa. I think disappointment is expected when you've read the orginal. I got lucky i found the kdrama first and it's awesome gotta read the manhwa after
I agree. Just finished the K-drama and absolutely loved it. It was kind of disappointing to see all of the bad comments about the adaptation, but also made me want to read the webtoon.
just wanna weigh which should i go first