Earlier today, we reported on f(x)'s Luna's appearance on "Strong Heart" and her reason for crying over Kang Ho Dong's words. On that same day, Luna performed a small piece from her debut musical "Legally Blonde". Dressed in her pink preppy outfit and sporting her blonde pigtails, Luna confidently danced and sang to "Positive". "Positive" is a song that Luna's character, Elle Woods, sings while thinking of ways to get her boyfriend, Warner, back. She first decides that she should seduce him by being sexy, but eventually concludes that the what she needs to do is dye her hair black. Check out Luna's short performance of "Positive" below!