After finishing this drama, I must say: WOW!!!!! I really really really.......loved this drama!!!! And why? There is more than one reason: 1) The story is amazing. It is about a group of young adults who are studying at the university in a musical department. It is about their past, present and future, about their dreams, relationships and problems. It has a realistic plot. It is a mature version of Dream High, but in my opinion, What's up is much better! The writers here did a great job! 2) The characters. Each character in this drama is unique, human and real. Each of them has own flaws but also positive aspects. My favourite characters were Oh Doo Ri (Im Ju Eun) and Kim Byung Gun (Jo Jung Suk). Both actors did an amazing job! I loved every scene with them! I loved Im Ju Eun in Wild Romance but after watching What's Up, I came to like her even more. Her character was just so cool! She was clever, crazy, a bit of a rebel but also nice and talented. I loved how she had one-sided love for her professor. Jo Jung Suk is one of my favourite actors and he was the reason why I started to watch this drama. I chose well, but did I expect something else from a drama starring Jo Jung Suk? No. His character here was hilarious, pitiful and I was just waiting till he finally showed his voice to the world. Jo Jung Suk is a really good singer and even better actor. You will see that you will love those too. On the other hand, I really disliked the character of Park Tae Yi. She was so naive and to me, she seemed stupid. 3) The music!! The music was outstanding! What a shame that I am not able to find the OST anywhere. Everyone sings very well but singing of few of them is just amazing! I was never a really big fan of Big Bang but I have to say that Daesung is a really good singer (however, his acting skills are really low). Jo Jung Suk is also an ace. And I also liked Im Ju Eun's singing. I was also surprised to see here a member of my favourite k-pop group SPICA, Yang Ji Won, whose singing was superb as well. 4) The ending! I really liked it. Even though I would like to reveal more, I won't. Just watch it yourself, you won't be disappointed. I guarantee it! 5) Jo Jung Suk - he just deserves his own point. 6) Im Ju Eun - so as her. Right now, I can't come up with more reasons to watch this drama. It is just superb! And who should watch this drama? - a music fan - a fan of Jo Jung Suk - a k-drama fan - a person who likes good quality series - a fan of Rachel from Heirs a.k.a Park Tae Yi - everyone who wants to watch something realistic - a person who appreciates good acting - ...... etc. I hope that you will enjoy this drama as much as I did!