f(x) member Luna will sing for the SBS weekend drama "Cheongdamdong Alice" OST.

The second OST, which will be revealed at noon on Saturday, will showcase Luna singing "It's Okay," which is a rock-type electronic sound. It was made by song writers who have written for Gummy, Big Mama, and Rumble Fish.

Luna has been hailed for her superior vocal skills and has experience participating in drama OSTs.

"Cheongdamdong Alice" is about an average girl Se Kyung (Moon Geun Young) who tries to marry into a wealthy household in Cheongdam. Park Si Hoo will play the male lead.

The song will premiere on Saturday.