On the July 24 broadcast of SBS "Strong Heart," Kyuhyun confessed, "I saw Leeteuk sleeping and I wanted to joke around. I poured water on him and he immediately reacted by hitting my head."

He continued, "I don't think Leeteuk could hold back his anger. With tens of staff members watching he said to me, 'You're a really bad guy,' and hit me again." Kyuhyun revealed that he had fought back tearing up, making everyone laugh.

Eunhyuk added, "We were all not in a good mood that day because when we performed with f(x) that day, Luna had hurt her ankle. Leeteuk had been trying to make everyone feel better, and he grew tired after a while. That's why he was sleeping." Eunhyuk did what he could to describe the situation more objectively.

Leeteuk shared, "Our members joke around pretty seriously. We even pull each other's clothes off. That day, other members had joked around with me, and then, Kyuhyun topped it off."

"After I hit him, I regretted it," Leeteuk shared, in an apologetic way. 

Photo Credit: SBS