...there truly are, but I can't possibly name all of them in one review so let's try to keep it short lol.
This show has some typical (k-)drama elements in it (the connection of the protagonists from their childhood, the seemingly bad boy and the overly good girl, a love triangle - or almost a love quartet?!) and only few surprises along the way.
But what makes this show more than worth it to watch is the plot, specifically the protagonists' past and the way they learn to cope with it years after a fateful event. Sounds kind of sad and bittersweet, right? Well, this show definitely is. But it's realistic and still not overly dramatic, mainly because of the main characters itself. There's no need to worry that this show is going to be all grey and dark all the time. There are funny moments as well. In short: the ups and downs of life.
And this show hits you hard when it comes to life lessons and life quotes, no matter how happy or sad they may be. I truly felt understood and could relate so much even though my life is nothing like the protagonists'.
Some of the side stories revolving around the supporting characters (mainly CEO Seo, the Cheongyu director/brother of Yoo Jin and Moon Soo's parents) were a little boring or annoying, probably because their stories didn't catch me and/or the characters annoyed me. Lee Gang Doo also pissed me off for two episodes, but softened my heart again with every following episode.
Anyways, that's why I didn't give a ten.
Still, this show fought its way into my heart - especially in the last third of the series - where it will have a special place forever.
Conclusion: A bittersweet, realistic, romantic drama which will catch you with its emotions and might make its way into your heart in spite of a few annoying/uninteresting supporting characters.