TVXQ's Yunho opened about his past experience with a particularly scary anti-fan.

TVXQ featured as guests on the "young mentors" special of KBS 2TV's 'Story Show Do Dream', where Yunho discussed a terrifying incident that occurred back in 2006.

He shared, "After drinking orange juice given to me by someone I thought was a staff member, I started vomiting blood." Yunho revealed that he didn't expect that anything was wrong until he got sick.

"At first I got angry, but when I heard that the anti-fan couldn't stand how I laughed and talked because of [his/her] own hard life, I thought I might cause [them] harm. After that happened, I would avoid people, and when I was in a similar place or saw similar items, my heart would respond first by beating fast."

Yunho continued, "To overcome my panic disorder, I drank up to 10 [bottles] of orange juice a day, and I felt better."

This episode of 'Story Show Do Dream' will air on October 6 at 10:25PM KST.