First things first: This show is definitely worth watching. Not because of the plot (it's pretty average and cliché if you ask me) but because of the amazing characters and the great OST.
There were quite a few characters I just loved seeing interacting so much, I wish I was a character myself and hang out with them. Especially the K&K boys, they were so adorable and fun!
The main couple was cute too but the evolvement and the stages of their relationship were so cliché, there were no real surprises there. Rather I was quite annoyed/frustrated with their behavior a few times.
The thing that annoyed me the most about this show and the main reason for minus points to me are the many many backflashes which were often repeatedly shown. If they were to be removed, I'm pretty sure this drama could be shortened to 2/3 of its current length. I'm not kidding.
Also, they focused too much on the backstory and past of Team Solo. A few backflashes to show what they've been like together and to explain their current relationship with each other would've been enough but nope, there several unnecessary backflash scenes and one of them was even 10 minutes long.10 MINUTE BACKFLASH IN JUST 1 EPISODE!!! To make it worse, their backflash scenes were even shown over and over again throughout the whole drama. Literally the exact same scenes! Kind of like the backflash of the backflash of the backflash! It was so tiring, I started skipping them.