[5] Kevin attended Dartmouth College from 2008 to 2012, where he majored in Government and Theater.

In April 2022, Kevin and actress Gong Hyo-jin admitted that they were dating.

[6][7] Later, on August 17, 2022, Kevin announced in letters posted on his social media accounts that they are getting married in October in the United States, and will be held privately with only close relatives from both families.

[10] Hankyung reported that Kevin has fulfilled his mandatory military service in December 2023 and currently serving as an active duty soldier.

[12] Kevin has dual citizenship, Korean and American, he enlisted in the military for a stable life in Korea with his wife.