It has been disclosed that KCM is a father of two daughters. As reported exclusively by Star News on the 19th, KCM, who was born in 1982 and is now 44 years old, got married to his non-celebrity girlfriend, A, who is nine years younger, four years ago. The couple already has two daughters. Their first daughter was born in 2012, when they were dating but due to personal reasons, they postponed their wedding. In 2021, amidst the pandemic, they officially got married without a ceremony and had a private vow exchange with their family. KCM, in an appearance on the SBS variety show 'Shoes Off, Dolsing For Man' in November 2022, revealed that they tied the knot after a decade of dating.

Despite being a frequent guest on variety shows, where he openly talks about his happy married life, KCM attracted attention for mentioning that his wife bears a resemblance to NJZ’s Minji and actress Han Ga In. In 2022, while actively promoting with the male vocal group MSG Wannabe on MBC’s 'Hangout With Yoo', KCM and his wife welcomed their second daughter.

In an interview with Star News, KCM mentioned, "During the time of my first daughter's birth, I was facing financial difficulties due to a fraud incident. Even though we couldn't marry then, we raised our daughter with care." He added, "After officially getting married in winter 2021, I have been happily living in Gimpo with my mother, my beloved spouse, and our two lovely daughters."

Recently, KCM took part in the 'Songs to Sing in Winter Part 2' song remake project on 'Hangout With Yoo'.