The actress has actually trained to become a singer since middle school. She used the stage name Jessica K as a back vocalist and pianist for singer Younha, who was her labelmate at the time. 

During a recent interview with TV Report, Kim Ji Won was asked if she has any regrets about not following her dreams of becoming a singer and taking on acting instead. 

The star answered, "I wanted to be an artist when I was a trainee. I still don't think I have talent in acting but definitely not for a singer. I don't have any regrets. I think I need to leave it up to the people who do have talent. Thankfully, I'm pursuing acting and I just want to focus on it."