On January 18, C9 Entertainment announced that Jung had joined eSports team, "Team Kongdoo", which specializes in PlayerUnknown's Battlegrounds (PUBG) as professional gamer and they held an initiation ceremony on January 17. On March 5, C9 Entertainment announced that Jung would be releasing a single at the end of the month. The single was later revealed to be titled "Fiancée" and is featured Korean rapper, Microdot. It set to be released on March 29 through digital download and CD. The song is written and composed by Jung Joon Young and Moon Kim from Royal Pirates and the rap part is written by Microdot. Jung held his solo concert, Sing on May 19 and 20 in Shinhwa Cardan Square Live Hall, Mapo, Seoul. Jung appeared in 2018 World DJ Festival Anthem Compilation, performing a new track called Fly alongside Advanced on May 28.
