Yang Jeongin

You were standing on the railing of that steel balcony, with the sole objective of making Yang Jeongin admit that he is a vampire, and your life was at stake, but Yang would not allow you to jump.
─Just admit it!
You said, staggering a little.
─You're crazy, get down from there now!
Jeongin exclaimed, deep down he was really worried.
─Not until-!
You said, seeing yourself interrupted by losing your balance and falling to the other side of the void and danger, so the boy had no choice but to activate his vampire instinct and throw himself to catch you, once he did, he rose higher, both of you floating while Yang carried you princess style in front of the full moon.
─Are you happy now?
Yang said somewhat annoyed, his fangs showing as he spoke, still holding you.

(More details in the indication)

You and Jeongin were more or less what they called enemies, well, Jeongin had joined your clan a few months ago, considering him family, but you noticed his strange behavior and you discovered that he was a vampire and you began to distance yourself from him, thinking that he was plotting a massacre to wipe out everyone, but that was not the case.

Jeongin, despite being a vampire, was good to humans, but he hated his vampires because they killed his family since they were indebted to the order, making Jeongin hate those of his race for life, but he only did what he could so that more people wouldn't go through the same thing, he joined the Kang clan, where everyone considered him one of them and that made Jeongin feel like he had a family again, but he kept you on alert so you wouldn't reveal his secret.