On the May 31 broadcast of KBS 'Mr. House Husband 2', Eli's family arrived at the beach on Jeju Island, where Ji Yeon Soo revealed the secret code the couple had used prior to their marriage.

She explained, "There was this code that only the two of us knew. 'DJ?JJ.B' which meant boss (Dae Jang) and servant (Jjol-byung). Eli wrote that often in the 'Thanks To' section in the U-KISS albums."

SEE ALSO: Singer-songwriter Paul Kim to marry girlfriend of 9 years