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The reason? Her bad singing. Nam Ji Hyun explained, "I really want to ban the video of that 'Some' stage. I really can't sing well. My friends know that I don't sing in front of other people. Yet I received a request from the 'What's With This Family' broadcasting station asking me to do the stage with Hyungsik since we were an on-screen couple. At first, I said I definitely would not do it, but because they persuaded me, I did it." 
 

She continued, "I worried a lot because I can't sing. But I wasn't burdened. I thought that because I wasn't a singer, I could empty out my heart and sing. If anything, the singer Hyungsik was under a lot of pressure. It seems like he felt pressured to do well. We couldn't practice a lot separately so we practiced during our spare time on the set. Thankfully, because Hyungsik took the lead, I was able to perform comfortably." 

Check out Nam Ji Hyun's performance with Hyungsik in the clip below. While Hyungsik definitely nails his part, Nam Ji Hyun proves that she really is an actress rather than a singer at heart. Still, her struggle is much more adorable than it is embarrassing. 'What's With This Family' shippers would surely grieve if the video were to be banned.