There was only thing that I was disappointed in and that was through the whole last episode, Yoo-rin didn't see/meet up with Seo Jung-woo once. Not once.
I knew from the first episode that the Yoo rin/Seol Gong-chan relationship was set in stone but I was always rooting for a chance for Yoo-rin to end up with Seo Jung. Even though I knew it was impossible. I really loved that guy most of all out of all the characters. He was a player, but he really liked Yoo-rin. Their relationship was so great to watch for me. Episode 9, with the cinema will always be my favorite bit. (especially the mum and dad part xD) and when he cried over her, my heart really went out to him. The fact that he's drop dead gorgeous kind of helped though. xD
Anyway, if I carried on ranting about how much I loved Yoo-rin/Seo Jung I'd be here all day.
I do like the fact that she ended up with Gong chan, if that ending couldn't have persuaded me than nothing could of. Their little arguments and Yoo-rins jokes on him are some of the things that make the relationship great.
Other thing I loved about this series, even the most serios parts could turn out to be hilarious. When Gong chan thought his Grandfather had died and it went all emotional when he dropped to his knees only to have Yoo-rin say "If he dies the machine has to go 'duuuuuuu'"
Also when the Grandfather insisted that Yoo rin's name be put on the family register (I don't think this part was actually intended to be funny to be honest, but still) and Gong chan was stubborn and refusing making his grandfather think it was about money.
"She can have a little bit"
"I don't want to"
Not exactly the right quotes though but close enough.
As the series progressed I found myself hating Seo-hyun more and more. Couldn't stand her near the end. She had to make things so much more difficult when things were already complicated enough as it was. The fact that she didn't like herself losing to 'someone like Yoo rin' really got on my nerves too.