Lyra, an up and coming African - American actress and screenwriter from the states, travels to Korea and is eyed by YG entertainment while singing at a Karaoke club. Papa YG propositions her to join a new subgroup of Big Bang consisting of her, TOP, Taeyang and G Dragon. After accepting the offer, fun, romance and suspense begin. Lyra and the guys hit it off and they instantly become best friends, however unrequited crushes, sticky relationships and a deadly secret a certain someone is hiding, enters the picture and threatens to tear both SUB-UNIT and YG apart. Watch as SUB-UNIT fights, to become one of Korea's and the world's top musical sensations, amidst it all. A fun wild ride about friendship, betrayal, love , deceit and making it to the top!