Hyun spent most of 2013 shooting ad commercials as an in-demand product endorser, and holding fan meetings all over Asia. For his acting comeback after military service, Hyun chose The Fatal Encounter, his first ever period film, in which he played the leading role of King Jeongjo who faced fierce party strife and assassination attempts during his reign. It was released in April 2014 and drew more than 3 million admissions. However, Hyun was criticized for his flat tonation and lack of emotions in the film, which received mostly negative reviews. In 2015, Hyun made a comeback in the Korean drama scene after 4 years with romantic comedy series Hyde, Jekyll, Me. In the drama inspired by the literary character, he plays a man with split personality disorder whose two personas both fall for the same woman. In January 2016, Hyun set up his own agency, VAST Entertainment, which became a wholly owned subsidiary of Kakao M three years later. 2017–present: Career resurgence Hyun returned to silver screen with the action-thriller film titled Confidential Assignment (2017), where he plays the role of a North Korean detective that is secretly sent to South Korea to apprehend a crime ring that is made up of North Korean traitors. The film was a success, and Hyun received positive reviews from critics for his action scenes and comedic performance. He then starred in crime action film The Swindlers, along with Yoo Ji-tae, about a prosecutor who plans to catch a con man who has swindled a large sum of money. The Swindlers was another box office hit for Hyun. In 2018, Hyun starred in crime thriller The Negotiation, playing a villain role for the first time, alongside Son Ye-jin; and zombie blockbuster Rampant (which was co-produced by VAST Entertainment). The same year, he returned to the small screen with fantasy suspense drama Memories of the Alhambra alongside Park Shin-hye. The series is one of highest rated Korean drama in cable television history, and Hyun was praised for his seemingly indifferent but humorous depiction of his character. In 2019, Hyun reunited with The Negotiation co-star Son Ye-jin in the hit romance drama Crash Landing on You as a North Korean army captain. The drama was a huge success and is the third-highest-rated Korean drama in cable television history, and Hyun was praised for his versatile range of emotions and acting skills. For his portrayal as