"You Know" (produced by Cha Cha Malone) is a story about a guy who is constantly making his ex lovers hotline bling, but purely for the pg18 stuff, as he (from what I gathered from the lyrics) doesn't want to be tied down just yet, but would rather fool around.
Rapped and sung by Jay Park and Okasian, two Korean artists who are making it big in the underground Korean hip hop scene, "You Know" is definitely a song to not pass up on. Even with the language barrier, this song still manages to weave into your ears and stay in your brain, leaving you mumbling along to whatever you think the lyrics are (as I do whenever I listen to this song).
If you'd like to check out more from Jay Park and Cha Cha Malone, they're both a part of rising Korean label called AOMG, which you can check out here
And as for Okasian, the only place Hes really active is on his Instagram (but he's under the company Hi-Lite Records, and you can find their YouTube channel here)