Rap Monster is older than Jihye and they share many things in common. For example, they both like Hip-Hop, the both rap, they're both dorks, and so on. They're like the best of friends that could never be separated. And when I say best friends, that includes all the teasing, hitting, tasering (hitting each other's sides) and pinching of cheeks. They're really close to each other and would do anything to protect one another. 

[[Forgot to mention all the swearing in this sorry xD And sorry for the terrible description Lol ^^;]]