Zion.T made his musical debut in 2011, collaborating with Korean hip hop artists such as Dok2, Crucial Star, Simon D, Primary, and Gray. His first single, “Click Me”, featuring Dok2, was released in April 2011.

On April 9, 2013, Zion.T’s first studio album, Red Light, was released with the title track “Babay”, featuring Gaeko. The album was critically well received.

In an exclusive interview with Kpopeurope in 2014, Zion.T explained that he chose his stage name because “I am a Christian and so the “T” in my name is representative of the cross.”

In 2014, he promoted the digital single “Yanghwa BRDG”, which became a hit and contributed to his rising mainstream success as an artist in Korea. The song’s honest, personal nature connected with a wide range of audiences.

On February 1, 2015, he collaborated with Korean R&B singer Crush on the single “Just (그냥)”. The same year, he released the digital singles “Zero Gravity (무중력)”, “Eat (꺼내 먹어요)” and “No Make Up (노메이크업)” and featured on singles by SHINee’s Jonghyun, Yankie, and Psy.

In 2016, following the end of his contract with hip hop label Amoeba Culture, he signed with The Black Label, a sub-label of YG Entertainment. On February 1, 2017, Zion.T released his first EP under The Black Label, OO.

In a 2017 CBS No Cut News interview, Zion.T said he was influenced by American musician T-Pain:

In December 2017, he released his collaboration with veteran singer Lee Moon-se, the song “Snow”. The song was very well received by the public, and topped all major music charts in South Korea. Lee Moon-se said he listened to Zion.T’s song for more than 200 times to faithfully represent his song, and showed great affection towards Zion.T and his musical career.