TVXQ's Yunho revealed a story on the October 14 airing of 'Knowing Brothers' about the time when he and Super Junior's Heechul fought for the first time.

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During the show, Super Junior's Heechul asked Yunho when he started to get into the whole home shopping culture. When Yunho answered the first time he really got into it was through a purchase of a leather jacket, Heechul remembered an incident that took place around the time.

Heechul said, "Donghae, Yunho, and I were watching a home shopping commercial. The commercial was promoting a nonflammable leather jacket and upon seeing that, Yunho bought the jacket." Heechul continued to tell the story in which he and Donghae kept on teasing Yunho to try it out and see if the jacket really was nonflammable.

Yunho spoke, "Because of all the teasing and challenges at me, my self-esteem was hurt and responded stronger than I needed to because I'm a blood type A and sensitive. But as I was reacting this way, Heechul hyung acted and said 'let's try putting it on fire' at the same time." Yunho finished humorously, "The jacket burned so well! I've never seen anything like it before." Heechul finally added, "That was the first time we ever fought with each other."

Did you catch TVXQ this week on 'Knowing Brothers'?