As mentioned in a previous comment here is some information regarding Lee Hyori's failed attempt at trying to get one of the biggest stars of the acting industry, and one of the biggest stars in the singing industry to get together. (Lee Jun Ki and BoA respectively.
Hyori revealed there could have been a romantic relationship between BoA and Lee Junki, a popular Korean actor. At Junki's birthday party on April 15th with his fans and his celebrity friends, Hyori said that she tried to hook Junki up with BoA because he seemed lonely.
According to an unnamed source, BoA and Junki met each other on Hyori's birthday in May last year. Hyori, a veteran in the Korean entertainment industry, is very close to both Junki and BoA.
But things did not go too well apparently, or at least not as well as Hyori hoped. Though Hyori hoped for a rosy outcome, BoA and Junki only ended up "remaining good friends" and no further advancements were made.
It was also mentioned in the Canadian-Chinese newspaper Ming Pao Daily April 17, 2007.
And somewhere posted in this community is a picture of Lee Jun Ki, Hyori, and BoA in the same picture.
Credits: Boangel @ Boajang [scans]
ZZOOzzoo @ Boajang [original translation]