I don't think that I can say anything than I already haven't said on the episodes reviews or that @chillikun hans't already said in their wonderful review of the series, but I'll try to add a little more:

DoDoSolSolLaLaSol started off really great, Go Ah-Ra FINALLY redeemed herself with this character (I find her characters in Reply 1994 and Black borderline annoying) and Lee Jae-Wook proved in his first screetime that HE was the male lead and noone else. All side characters were lovable and their histories and interactions with the couple were simply BEAUTIFUL and a HIGHLIGHT of the series, but with all this out of the way, aren't we all tired of love triangles at this point?! And this series has WAY TOO MANY, at some points I was wondering if that's the only way to display relationships in the writers mind. We had all classical love triangles in just ONE SERIES, the best friend one, the childhood friend, the rich kid, and the poor one, the mature guy, the naive girl, the bad guy who actually has a big heart...it was TIRING to see every single relationship being displayed and introduced as a love triangle, geez give us a break.

Mid-Season was a mistake, just like Record of Youth, this was when the series lost it's mojo and pace, specially when it came to Jun's character, he became a bland stereotype of male lead and the twist to justify it was "meh" to say the least, not to mention a HUGE overshadow that was being build to one character changed last minute to actually be HIS plot. And so, we arrive at the last episode, I was really excited and thinking THIS is a BOLD move, and I hope they stick to it, and was specially excited to prove myself wrong in my first and previous predicts about this series plot, cause that would make the series closure chefs kiss, Seo Yoon-Sil and Lee Soon-Jae's acting were ON POINT and made me really love the direction and how they were handling their choice, but then...last minute...ugh...it was just THE perfect example of how Korean dramas ruin their plots and histories, because they don't have back bones to display things realistic and stick to bold choices.

Looking back at the scores, I see that most episodes were given 7/10, with only episodes 3 and 6 getting 10/10, and the overall series getting a 5/10 simply because the good episodes got those scores based on the actors performances, not the plot itself, and many sub-plots and twists were just...poor handled (specially dodosolsollalasol identity reveal, which was SO anti-climatic due to writers "filling up for the last episode" choice).

Do I recommend it? No, unless you want something silly to binge watch while you do other things, or if you're good at not getting attached to characters. If you watched Record of Youth, My Firs First Love and is watching Start Up right now, and feeling rage quits moments, stay away from this series, as it has ALL the problems these other series have.