Frankly speaking, I was excited upon the announcement of season 3, but after watching the teaser, I was left with utter discouragement and was therefore not expecting anything highly from this series; my excitement diminished. With that being said, as someone who wants closure and hates to leave things unfinished, I caved through this season despite the flaws and cringey moments that this series brang.

We see a timelapse of the characters moving onto university life and a series of mysteries that carry the entire plot of the show; the most prominent ones are Yeondu X Hyunho and Seol X Junho. To my dismay, the concepts of this season seem to be about a dejavu of season 2: stupidly throwing in additional and unnecessary love-triangles rivalry, stalking, fake friends, and old toxic romances. The writers should focus on the characters and their development into a new environment, but I can not help but think this is just yet another immature high-school story.

Yeondu - I enjoyed her slight development as she is now able to speak her mind (for the most part) and is able to stand up for herself, but she is still as naive as she were in the previous seasons

Ahra - Many people were bothered by her character due to the fact that she was easily forgiven. Whilst I can understand a bit from the writer's perspective and the timeframe of where this season is set (2 years later, I believe), it is kind of far-fetched for her to now be part of Yeondu's friend group and act as nothing has ever happened.

Yuna - Other than the main protagonist, she was the character that bothered me the most with her stalkerish behaviour and inconsideration of how others may feel. Whilst this drama is light and for entertainment, I cannot help but feel more agitated about her character than the actual protagonist.

Seunghyeon - I have nothing against his character, but the way the writers had to force his character to be with someone and all of a sudden change how he feels towards someone in a span of an episode are beyond my amazement.
I was interested in how his character moves around the idea of rejecting a persistent and somewhat creepy girl and to prove a point that not all romances blossom and work out. But this drama seems to reject this idea.

Overall, it just seemed like the rest of the cast were there to act as fillers and none of their narratives developed in the slightest.

If you are coming from the previous seasons, it is just best to leave this drama at season 2 as everything, including the ending, seems to be just a repetition of that. For 16 episodes, it was really unnecessary to drag the whole series out for that long.
Season 1 is the best as it lives up to its title, but the others were utter disappointments.