Ku Hye Sun was married on May 21
st, 2016, her husband name is
Ahn Jae Hyun (He is a South Korean actor, model both are worked the same drama "Blood"). On March 11
th, 2016, Ku Hye Sun was confirmed to be dating her Blood co-star Ahn Jae-Hyun since April 2015.
The couple officially registered their marriage at the Gangnam district office on May 20th, 2016, and married on May 21st, 2016. They announced that instead of holding a wedding party.