I started this drama because it had Gong Yoo (we meet in 'Goblin') & Gong Hyo Jin ( meet by 'Master's Sun'), my two favorite actors. So I was sure that this won't let me down. And it didn't. Here are the reasons why I loved it. The cast. Gong Yoo. I don't think I need to say anything else about him. He is the most perfect actor I have ever seen. I thought he was amazing in 'Goblin' because as you grow your skills developed. But this show which is from 2005 almost 12 years before 'Goblin' and even then he knew how to play with emotions and expressions like no one else. Because the faces he makes, are merciless. Park Tae In was crazy and playful and you just watch him grow. He was perfect. I love Park Tae In. He is my favorite character ever. I just loved the craziness in it, in him. He is awesome. I love Park Tae In. Gong Hyo Jin playing the older teacher Na Bo Ri. I didn't liked her character. Because she just made Tae In cry so much. But Hyo Jin did a really good job. Kim Da Hyun, Choi Yeo Jin, Kang Do Han, Jo Hyung Ki and many more who's name I don't know, were all amazing in their respective characters. The story. God I loved it. The beginning was so, so funny and hilarious. And then it started to get a little serious. Some will say that the story drags in the middle but I disagree. It doesn't. Instead it moves in a pace that was necessary for the characters to develop. The side-stories was only for Tae In and Na Bo Ri to realized what they were to themselves. Sometime they were a shoulder to cry on, sometime a friend to talk to, a mentor, a loves. ^_^ And then the ending. It was hands down the best ending I had seen. I usually don't like how my favorite shows ends. Because well, it's ending and I always has something else in mind. But this one was just perfect. Sweet and perfect. The music. I love them. Played 'Only you' a hundred time by now. Only problem is that I can't find the rest of them. Will I rewatch it again? Yes, I'll! In short. If you want to see thousand and one expressions by Gong Yoo's, and want to laugh, cry, learn some lessons about life and friends? Or just want to watch Gong Yoo as an crazy teen. Than watch this drama without any other thought.