I think it's about the time to explain some things, because I got some questions and I feel the need to make a separate post answering them =)
1. Fangs. Yes, they have them all the time, but it's not very visible unless they laugh or smile widely. The other thing - the more hungry they are, the more their fangs are visible. Just like Junho, who is a newborn - it was hard for him at first because of his thirst, that's why he kept biting on his lips. Normally, when they're not too hungry and satisfied, I'd say the lenght of their fangs is about 1 centimeter. Since they don't communicate with humans much, are careful being around them - it's not that hard to hide.
2. Purebloods. No one can be a pureblood if they were a human before/turned by another vampire/turned by a pureblood. Purebloods in my fiction are very rare species. They're born only to pureblood vampires (female pureblood+male pureblood=vampire pureblood). I'll explain this further in Silver =) Forgot one thing - ONLY PUREBLOODS CAN GIVE BIRTH TO A VAMPIRE.
3. Final bonding. It's made only by purebloods, usually to make their bond stronger, to show their commitment and trust. In a way, it could be considered as marriage, but it has a much deeper meaning than a simple human marriage. Chansung's decision to make the final bonding with Junho - well, I'd say Chansung is a rebellious pureblood ;)
4. Nichkhun. Yes, he will appear. I didn't forget about him, but I can't reveal anything right now, it'd be boring ;) I'm not planning on Khunyoung, it's impossible for all vampires to be homosexuals, as much as we'd like it to be, LOL. Yes, I'm a bit of a sadist, especially in aspect of not writing about Khunyoung, so deal with it 8D
5. I don't like Twilight, lol.
In case you're wondering how I imagine Chansung in this fic, here's the picture: