Lee Seok Hoon is a member of SG Wannabe.
He is married to ballerina Choi Sun A, a former member of the Korea National Ballet, and they have a son, born in August 2018. They first met on the MBC dating program Exciting Love Studio in 2011 and continued their relationship off-screen. The couple secretly registered their marriage in 2014 while he was still in the army and later had a private wedding ceremony in January 2016.