People are being way too harsh with their comments. You don't have to like everything the author does, but keep your remarks decent?
I like Doyeon as a character, so it saddens me to say I think the author really did him and the whole story's development a disservice by the way they structured and paced the episodes in this season. It went from a really promising opportunity to understand Daehyung's past relationships and approach to love, Yiyoung's sincerity and commitment to show him that it's not just a temporary experience for him and how to figure out what kind of relationship they both want to be in from then on -> to something that felt just dragging and lost its meaning and purpose in relevance to the rest of the plot.
I hope they can come back with a clearer goal and better execution in the next season, I'm not giving up on them!!