Lee Sung-jong

Lee Sung-jong (Hangul: 이성종; hanja: 李成種; born September 3, 1993), commonly known as Sungjong, is a South Korean singer. He is a vocalist of the South Korean boy band Infinite under Woollim Entertainment. He is also the vocalist of Infinite F.
Biography.
Lee Sung-jong was born in Gwangju City, South Korea, on September 3, 1993. He moved to Andong when he was 9. He has a younger brother three years younger than him named Lee Seon-gyu. He graduated from Jeonju Arts High School on February 7, 2012, and was studying at Kongju University.
On July 29, 2019, he revealed on his Instagram that he had quietly enlisted for his mandatory military service. He enlisted on July 22 as a public service worker. His military service ended on May 8, 2021.
Career.
Infinite.
Sungjong was first introduced as a vocalist of the boy band Infinite in 2010. His first appearance as a member was during Infinite's pre-debut reality show "You Are My Oppa". The group officially debuted on June 9, 2010.
Infinite F.
Infinite F was officially announced during the One Great Step Returns encore concert and consists of members Sungyeol, L, and Sungjong. There, they performed the song "My Heart is Beating". The unit released their first song "I'm Going Crazy" in Infinite's 2nd album, "Season 2". On November 19, 2014, they made their official debut in Japan with their album, "Koi No Sign" and debuted in Korea with the single album, "Azure" on December 2, 2014.