On the October 17 installment of MBC's 'Tutoring Different Generations,' Heechul talked about how he and Son Dam Bi called each other "my man" and "my woman," an already well-known fact to fans.

Son Dam Bi said to Heechul's Chinese tutor Z.HERA, "Be a bit more tough on him."  Also on the show, the two called each other "my man" and "my woman," raising curiosity about their relationship.

Heechul explained, "They are simple endearments we call each other all the time when we do not have significant others.  If I called her on TV and said 'Dam Bi' [instead of 'my woman'], that means I have a girlfriend," making everyone laugh.

You can watch the segment at around the 2:50 mark above.