Reasons:

1. Bright colours and n the simple but nice setting that gives the friendly warm vibes.
2. The simple, adorable plot...a group of guys playing guardian angel/cupid for the girl they like to help her get the guy she likes. d'awww. seriously....wae so adorable?...><
3. The girl is so pretty n seems likable n good acting xD...out of all girls in ZE:A MVs, i like her the best though i don't know her lol. who is she anyway, anyone knows?
4. There's Jangmoon!!! omg!!! (A'ST1 fan here)
5. I love the hairs n styles of the members...ok, fine Hyungsik not so much....butbut...Minwoo's tied hair n glasses...omg...soo adddorable. xD
6. The interesting dance lol.
7. I even love the BTS/making of the MV
8. I love that there's no main character here besides the girl..and all members had fair chance to shine.
9. For anything that i forgot..i love everything abt this MV. haa.

and if i may add another one...just for fun...xD

why? well...didn't the video answer everything? lol. the silly dorks. (too bad it's not their own MV..they need to have a silly MV too xD)

n my heewan <3