After School's Uee burst into tears.

The normally bright and energetic Uee broke down on SBS "Fists of Shaolin Temple" shown on December 12.

Uee was challenged to run on a 5m-high railing without any connected safety equipment in order to overcome her fear of heights.

Uee has usually been strong and willing to try any challenge given to her, but she showed frailty for the first time as she waited for her turn.

"I have a really big fear of heights. If my feet are above the ground at all or if there are no safety equipment connected to me, I'm not able to perform to 100 percent of my ability," said Uee.

Uee then slowly started her training but she couldn't handle it and burst into tears, bringing worry and sadness to others as well.

This episode aired on December 12.