Actor Jang Hyun Sung says his kids learned taekwondo to teach JYJ's Yoochun a lesson?

On the May 6 episode of MBC's 'Radio Star' actor Jang Hyun Sung dished on a funny story regarding his kids, whom you might remember from 'Superman is Back'!

He said, "A while back I acted with JYJ's Yoochun in the drama 'Three Days'. I didn't show the drama to my kids at the time, but they heard about the drama through their school friends. So I showed them one episode, but that episode had a scene where I died from Yoochun's gun shot."

He continued, "But when the kids saw that scene they sobbed. I thought that it was cute that they were crying so hard even though I was alive right beside them... After that, the kids began to learn taekwondo saying they were going to teach Yoochun a lesson, and they still are learning it now," he said as he laughed.