When asked how he became a singer, Yongguk commented, "It goes back to middle school. At that time, I was doing underground hiphop. After becoming an adult, I was introduced to TS Entertainment by Untouchable hyungs, and entered this company. After that, I was preparing for B.A.P and did other promotional activities, the time of preparation with B.A.P was about one year. For myself, it took me 6 years before I debuted."