We reported earlier that Secret's Song Ji Eun would be joining Untouchable on stage to fill in for Brown Eyed Girls member Narsha. Now the hip hop duo performs their hit Living in the Heart with Ji Eun on Music Bank! With Narsha having her own obligations to her group activities, we knew she couldn't appear on stage all the time with Untouchable. So in her stead is Ji Eun, who gives the song a whole new feel, just how she promised us earlier. And although her vocal style is different from Narsha, it's still amazing. Watch the performance below! So who do you guys prefer for this track, Narsha or Ji Eun?