Lee Tae-il was born in Seoul, South Korea, where he lived with his parents, elder sister and younger brother.

[1] He graduated from Global Cyber University and previously attended Kim Myung-ki's Vocal Academy.

[4] He also did a seven-show, six-city tour of Japan from August 26 to September 7, 2017, along with fellow Block B member U-Kwon as the special unit T2u.

[6] Taeil's first solo concert in Korea was announced November 2018 and scheduled to take place on December 22 and 23 in Seoul's Olympic Park K-Art Hall.

[11] After fulfilling his term of service, Taeil returned home on leave December 4, 2020, with his discharge becoming official the following month.