Before pursuing a solo career with the single "Beograd još živi" (2015), he rose to prominence as the member of the hip hop duo Elitni Odredi, alongside Vlada Matović.
His mother, Zoja Begolli (née Đoković), was a ballet dancer at the National Theatre in Belgrade and lecturer at the Academy of Arts,[1][2] and his father, Srđan Popović, worked as a sports journalist for the daily newspaper Večernje novosti.
Relja stated that he found passion for hip-hop as a child, being exposed by his older brother Miša to artists such as Eminem, Jay-Z and Juice.
[3][6] Popović began his professional music career in 2005 alongside his childhood friend Vladimir Matović, as a part of Elitni Odredi.
[9] It was succeeded with a series of other standalone singles during the next couple of years, including "Crni sin" featuring Coby and Cvija, released in May 2016.
[12] With the release of the single "Princeza na belom" in June 2019, Popović announced his debut body of work Made In BLKN.
[17] It was followed by "Offline" featuring Devito, "Manije" and "Kraj je", which alongside "Maria" and "Genge" were included to the second part of his debut solo project.
[18] "Omađijala" peaked at number 2 on Billboard's Croatia Songs chart, whilst the music video has collected over 40 million views.
[19] In March, Popović alongside Teodora Džehverović and Darko Dimitrov was announced as a judge and coach on the singing competition series IDJ Show.
[28] Serbian LGBT portal GayEcho also nominated Popović for the male gay icon of 2011 because of his performance in the film, which he ultimately lost to Bosnian model Andreja Pejić.
[31] Popović graduated from the Faculty of Media and Communications at the Singidunum University and also studied acting at the Academy of Arts in Belgrade.