The main story was about taewoon's being X and other's finding the 'X'.

Story:
I didn't know i'd like this drama after finishing it. But the story made me to like it. Some of the screenwritings were boring in the last few episodes. But the ending filled out the lacking.

Cast:
The casting was so good. Not only the main lead. I liked the principal's acting from the supporting actors the most. Dae-hwi's acting disappointed me a little though. He could've done better. But i was glad he was reunited with nam joo.

Music: I personally loved the music. Not so special, but enjoyable.

Rewatch value: Don't mind my rewatch value. I don't usually rewatch any drama. but i rewatched it one time.

The hot topic 'KISSING':
All viewers (including me) expected a kissing scene between tae woon & eun ho. But unfortunately there was none. Maybe because they're high schoolers. But who told that high schoolers can't kiss? Like that's so back-minded. But yeah, we got a kiss scene between two teachers Mr.Shim & Ms.Han.

*Was it worth watching?'
A BIG YES. Because i personally like a drama when there is a happy ending. And it had a happy ending. The finishing of every episode will make you watch the next episode. But the first half of ep 16 was so boring. But as i said the ending will make you feel that 'it was worth watching'.