One of my favorite dramas of all time. This is an emotional, cute and at times heartbreaking ride.
This review contains some spoilers

I've been following Kim So Hyun's works since I saw and loved her in Missing You. Really, she became one of my favorite korean actresses, everything about her is so natural and sincere, her acting really gets you on the character's skin and makes you laugh and cry whenever she does. One of the most promissing(if not the most) actresses out there. But the show doesn't resume on her acting, I also thought  Yook Sung Jae did an excelent job as the problematic yet quirky Tae Gwang. Seriously, he and So Hyun had such chemistry...(I'm still butthurt because they didn't end together)

Gushing aside, the story was also pretty well executed, with just some flaws and plot holes here and there. I know that this amnesia plot is extremely overused, but instead of just being used as a plot device, the amnesia is well developed and it even helps on the development of Eun Bi. Seriously, she goes from a girl who lost her courage, to someone who could impersonate her twin's attitude and then changed (again) to someone who could fend for herself and face her problems instead of running away.

The love triangle was also well executed, but poorly solved. *SPOILER* Really, I can't believe that they built such a relationship between Eun Bi and Tae Gwang, only for her to end up with the guy that spent basically the entire drama longing for her sister. I'm still pissed at this.

Another thing that could be promissing but ended up poorly executed was Eun Byl's character. Really, the girl was like no other I've seen in dramas (at least so far) and I surelly wanted to see more of her, and therefore more a development for her character. It was like a breath of fresh air when she finally showed up and gave the bully girl what she deserved. I was the entire time cheering: "You go girl!" Also, kudos for Kim So Hyun for managing to deliver two completely different characters.

Also, apart from romance and characters, I really liked the way this series handled issues like bullying. It was very saddening to see how much one is willing to hurt the other only because of their own internal struggles. Even though I didn't like the character one bit, I have to congratulate Jo Soo Hyang's job, because it was so well done that she made me really hate her but at the same time sort of understanding where she came from.

All in all, it was a very good drama. I openly recommend you to watch and fall in love with this coming of age story.