Ok, I'm starting to get into the territory with my answers with some members that I doubt I'd even answer the way I want to... Let's continue!

I think it has to do with this video right here:

He almost became my bias because of it. Wow. What a fierce man. The way he performs and how passionately he does so is amazing. I love how crazy he is in variety shows. (Please also see this).

I love him in Simon and Martina's interview, too. I love when he speaks English, his sparkly eyes, his hair, how fun he is, how talented he his, that he's good at athletics, that he has facebook!!! I LOVE THAT HE LOOKS LIKE HAN GA IN. I think he brings "wow" into ZE:A's dancing (maybe because he was in gymnastics, I LOVE gymnastics~~ ooh, another thing that makes him special! I think when it comes to acting, he is very cute. Also, how cute is he in "Let's Go, Dream Team"? The scary maknae. Keep staying your healthy, fit self, Kim Dongjun!

Once, Kwanghee said Dongjun kept straightening his naturally curly hair! Lol! I love that he has naturally curly hair! And that he'd straighten it! I think this was in one of their older appearances in a variety interview show.

And, I like Kwanghee's charming voice so much, and how beautiful Hyungsik's voice is. But, back to "Hot Stuff," Dongjun's voice and how he sings! Wow! How he powerfully sings may make his voice my favorite in ZE:A and why I love ZE:A so much. His powerful singing and voice is a reason why ZE:A is so spazz-worthy; why Dongjun is so important to the ZE:A team; why ZE:As freak out so much over ZE:A, partly because of what he brings to ZE:A. He really has a talent he loves sharing with the world. I wonder if his voice is so strong because his body's so strong. He makes people go crazy and is an amazing performer; frankly, I don't know if if I've seen many vocalists outside of opera (no, I don't keep up with opera, hehe) who can sing as powerfully as he does! Maybe DBSK? Justin Timberlake? Actually, I don't know too much about kpop and singers who can sing while dancing well...LIVE. Which makes him simultaneously singing and dancing live really stand out. And his pitch sounds right on it while doing so, too. I'm keeping an eye on this guy. I'm excited to keep looking forward to his performances and career and keep supporting him.

He's just lovely.

Tl;dr version: Strong body; strong vocals