For me it's a yes, specially red string even though the whole concept of it was basically smut but in a way for me, its become boring. I liked it but... I think this series would have been better as those 8-12 chapters of BLs. I don't need like 20 more (though do tell me if it gets better i dropped it around 10 chapts lol) that's my opinion on that manhwa, I feel like alot of authors just add nsfw scenes but forget the plot and their relationship.
