2PM member Wooyoung revealed that preparation for his solo debut was hard.

On Monday's broadcast of KBS' "1 vs. 100," model and entertainer Hong Jin Kyung and now soloist Wooyoung appeared on the show and went against the 100 competitors.

On this day, when Wooyoung was asked about his hair color transformation, he remarked, "I bleached my hair 15 times. I thought maybe 2 times would do the job but that wasn't the case. I even suffered burns at the back of my head because of the dyeing."

He continued, "I continued with my hair transformation while putting ointment on my burn scars."

On another note, the 100-member competitors on this episode included celebrities such as producer Lee Hye Young, designer Ha Sang Baek, Yang Bae Chu, Nam Chang Hee, Kim In Suk.