Kim Jong-hyun (Hangul: 김종현; born June 8, 1995), more commonly known by his stage name JR, is a South Korean singer, actor, and member of the South Korean boy group NU'EST. He is also known for competing in the 2017 series Produce 101 Season 2. Kim Jong-hyun (Hangul: 김종현; born June 8, 1995), more commonly known by his stage name JR, is a South Korean singer, actor, and member of the South Korean boy group NU'EST. He is also known for competing in the 2017 series Produce 101 Season 2.