In February 2010 Eun announced that he would marry his first love, a woman two years his senior. They knew each other since 1994 in Hawaii, but broke up later when Eun returned to South Korea to start Sechs Kies. Eun and Lee Sooyeon were reunited 13 years later, and engaged in a steady relationship. Eun's fiancée was sister-in-law by marriage to soccer player Lee Dong-Gook. On April 7 Eun left for Hawaii to prepare for the wedding ceremony, scheduled for April 20. Although filming for "1 Night 2 Days" was postponed due to the ROKS "Cheonan" sinking, Eun and his parents returned to South Korea on April 22 and he was interviewed on SBS's "One Night's TV Entertainment"; he said it was like filming a commercial with his wife. On April 29 the first photo of the wedding ceremony was leaked to the public, in which the couple is walking down the aisle with family and friends congratulating them.