Round 3 is Kim Hyun-joong's third Korean mini-album, which was released on July 22, 2013.
Kim Kyu Jong (; born February 24, 1987) is a South Korean entertainer, actor, and a member of boyband SS501.
Park Jung-Min (; born: April 3, 1987) is a South Korean singer, entertainer, actor, and a member of boyband SS501.
Ok Taec-yeon, composing as Taecyeon a.k.a TY, is a South Korean actor, entrepreneur, singer, songwriter and the main rapper of the South Korean boy group 2PM.
 In 2012, Taecyeon teamed up with his fellow Dankook University alumni students to produce a digital album and then began writing and composing songs for his solo stage at 2PM Japanese Concert, 'Six Beautiful Days' in Budokan.
 Taecyeon started actively participating in writing and composing songs for 2PM the following year.
Ok Taec-yeon (; born December 27, 1988), known mononymously as Taecyeon, is a South Korean rapper, singer, songwriter, actor and entrepreneur.
 He is the main rapper of the South Korean boy group 2PM.
Heo Young-Saeng (; born: November 3, 1986) is a South Korean entertainer and the main vocalist of boyband SS501.
 He's also the leader of 'Double S 301'.
Jang Dong-woo (Hangul: 장동우; hanja: 張東雨; born November 22, 1990), commonly known as Dongwoo is a South Korean singer, rapper, and actor.
 He is the main rapper of South Korean boy band Infiniteand Infinite H.
Kim Hyung-jun (; born August 3, 1987) is a South Korean entertainer, lead rapper and youngest member of boyband SS501 and SS301.
Kim Hyun-joong (; born June 6, 1986) is a South Korean actor and singer, and the leader and main rapper of boyband SS501.
Cha Sun-woo (born September 5, 1992), better known by his stage name Baro, is a South Korean singer, rapper, and actor.
 He is the main rapper of South Korean boy group B1A4 and debuted alongside with the group on the stage of MBC "Show!
 Music Core" on April 23, 2011.
 He made his acting debut through the hit 2013 cable drama "Reply 1994" and additionally received critical acclaim for his role in the 2014 drama "God's Gift - 14 Days".
 Baro won 12 medals in Idol Star Athletics Championships with 3 golds, 7 silvers and 2 bronzes.

Question: Round 3 is by which South Korean actor and singer, and the leader and main rapper of boyband SS501?
Answer: Kim Hyun-joong