On the July 22 installment of KBS 2TV's 'Our Neighborhood Arts and Physical Education,' Kim Tae Hee's younger brother Lee Wan appeared on the show and talked about his sister's relationship with world star, Rain.  

SEE ALSO: Rain refutes marriage rumors with Kim Tae Hee

Kang Ho Dong and Jung Hyung Don asked him how he addressed his sister's boyfriend.  At first, Lee Wan played dumb, but this didn't work, so he said in the end, "We're still awkward, so we address each other formally."  For example, they would attach the form "-ssi" to the end of their names, which almost stands in as "Mr." and "Ms."

Meanwhile, both Kim Tae Hee and Rain were recently baptized in front of friends and family, but denied any marriage plans as of yet.