The actress said, "I auditioned for 'Eungyo' at the last minute and by chance, but I ended up being cast for a role. From the film's crew, I knew someone from school, and I had gone to visit that person and the director [of 'Eungyo'] was also there so I got to chat with him. He told me to come prepared with a simple line but it actually turned out to be a big scale audition. That was my first audition ever."
Kim Go Eun continued, "When the director asked me if I would do the role, I told him that I didn't think that I'd be able to. It all happened in a matter of two days. I hadn't prepare to audition for this movie; rather, my heart wasn't prepared [to take the role]. I couldn't make up my mind because of the unconventional scenes but [the director] told me that he'd give me time [to think about it]. Later, when I asked him why he had set my eyes on me for the role, he told me that it was because I looked like someone bursting with curiosity."