In 2016, he won the twelfth season of Swedish Idol series and released his winner's single "Playing with Fire".

[3] In 2016, Cacatian Thomassen auditioned to take part in the twelfth season of Swedish Idol.

After winning Idol, Cacatian Thomassen released his winner's single "Playing with Fire".

Liamoo competed in Melodifestivalen 2018 with the song "Last Breath", and finished in sixth place in the final.

He also participated in Melodifestivalen 2019 with the song "Hold You" in a duet with Hanna Ferm; they finished in third place.