I can't be biased because I stan exo, but here is my honest review:

STORY:
I liked the plot and I thought it was very original. It was also carried out very well between the two leads. I found myself laughing and swooning at their character development. The only thing I didn't like was how rushed the ending felt. I wish they gave more time to allow the relationship to develop instead of rushing into a dramatic conflict. Overall, I was pleasantly surprised by this film.

ACTING/CAST:
Yuan ShanShan is one of my favorite C-Actresses and I think she did a wonderful job in her role. She gave her character a quirky personality that made her hard to dislike. Chanyeol was also very good considering the fact that he's an idol and not a professional actor. I could even understand the Chinese! Other than the two leads, the rest of the characters were rather static and boring. I won't give any spoilers, but something really cute happens towards the end that had me screaming.

MUSIC:
LOL was there any? If so I didn't notice.

REWATCH VALUE:
I gave this a 10 because it's one of those refreshing films you can watch again when you're bored.

OVERALL:
I really liked this film and there are so many cute and funny moments! You should give it a shot!