K-fiend
A person who's completely lost in the K-world. They won't talk to you unless you mention K-pop, K-dramas, or Korean stuff. They'll even throw a fit if you say the wrong Korean word.
She texted me 20 times just to tell me she watched a K-drama and cried.
He turned his phone off during a K-pop concert just to listen to it on his own.
He got a tattoo of a K-drama character and now won't stop talking about it.