2AM's Jo Kwon shared a story regarding his pre-debut, trainee life with SISTAR's Hyorin.

On the March 2nd episode of MBC's 'Quiz to Change the World', after Jo Kwon expressed his interest in a 90s MBC sitcom 'Three Guys and Three Girls', he and SISTAR's Hyorin became the center of attention.

There was an awkward atmosphere about the two idols, as they couldn't even look each other in the eye. Noticing this, an MC pointed out, "You two are really indifferent [towards each other]. Did something happen between you two? Greet each other. Why do you guys act exactly like people who were once close and then fell apart? Did someone confess and get rejected?"

At this, fellow 2AM member Changmin offered a possible explanation, saying, "Jo Kwon scolded Hyorin once when they were trainees."

Jo Kwon clarified, "[When we were trainees,] Hyorin was the number one candidate for JYP auditions. In order to ensure she didn't get too prideful about this, however, the trainee sunbaes, myself included, would purposely act scarily towards her," thus revealing the reason behind the strange tension between the two idol.

Was ok for him to scold Hyorin to prevent her from being too cocky?