On June 30 episode of MBC's radio star, Jo Kwon made a guest appearance.

Jo Kwon said, "Yes, there is. When 2AM was active, we signed with both JYP Entertainment and Big Hit Entertainment."
He resumed, "At the end of the dual contract in 2014, I had to choose one to stay with. At that time, Bang Si-hyuk asked whether I wanted to sign with Big Hit Entertainment."
He explained, "That was when 2AM's popularity skyrocketed with 'Never Let You Go', which was written by Bang Si-hyuk."

Jo Kwon said, "As I had trained under JYP Entertainment for a long time, I decided to go with JYP Entertainment, completely leaving BIg Hit Entertainment."
He continued, "That's what I truly regret. Big Hit Entertainment became huge after I left. They even use the largest building in Yongsan-gu now."
He added with a sad look on his face, "It's sad, because I lost touch with Bang Si-hyuk afterwards as well. I used to keep in touch with him often, but not anymore."

(SBS Star)