Lee Jong Suk revealed the secret behind the trendy phrase 'bbooing bbooing.’

On May 22, Lee Jong Suk came out in SBS 'Strong Heart' and said, "At first when I read the script for 'High Kick 3' I laughed for 30 minutes straight. The script clearly said 'bbooing bbooing.’”

He continued, "I practiced it with various hand motions. When I was in the middle of a dilemma, Krystal came and showed me how to do it so that's how I did it in High Kick."

He added, "It was hard getting the phrase 'bbooing bbooing' out of my mouth before filming. I couldn't practice even in the empty waiting room. I couldn't say it even once before actually filming for it. I did it at once while filming because if I get an NG I have to do it twice. Luckily it came out well."

Photo: SBS