If you've seen "Intimate Note" HyunSaeng had mentioned this during the show before.

Credit: star@donga.com + (English Translation) xiaochu @ Quainte501.com
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SS501 member Heo YoungSaeng revealed the story with his same group member Kim HyunJoong.

Heo YoungSaeng appeared in KBS2 ‘Happy Together’ to be broadcasted on 12-May and opened up the talk “I normally lit up candles in my house and drink (alcohol) with Kim HyunJoong. I received a call unexpectedly by a friend who asked for a meet up, so I left Kim HyunJoong who was sleeping in the house and went out.”

He continued “I went out to meet my friend outside for quite a while, then I was being contacted that ‘my house was on fire’, so I rushed back home and saw the 119 fire engine in front of my house making a big fuss. I was so worried about Kim HyunJoong who was sleeping inside the house, so I dashed into my house and Kim HyunJoong was sleeping safe and sound despite the fire. Fortunately, my house wasn’t burnt badly.”

“I am very sorry to Kim HyunJoong who almost died because of me, but it became a story for Kim HyunJoong to talk about in broadcast shows and laughed at it.” Heo YoungSaeng confessed, bring a burst of laughter in the bathhouse.