He is best known for being in the sitcom, Nonstop and for co-hosting two popular variety programs, MBC's Infinite Challenge and SBS's Running Man.

Haha was born on August 20, 1979, in Stuttgart, Baden-Württemberg, West Germany and moved to Seoul, South Korea when he was an infant.

After leaving Nonstop, Haha spent two years alongside singer Taw, to prepare and record his debut album titled, "The Beautiful Rhyme Diary".

The album was released on February 18, 2005, alongside his debut single, "Love Song" but it failed to chart or garner popularity.

His sudden popularity spike allowed him to become a regular guest for X-man, arguably the biggest variety show of that time.

[9] In his final episode before entering the service, Haha performed at a guerilla concert at Yeouido Park that was secretly organized by his fellow co-hosts.

The single managed to reach number one on the Gaon Chart and he performed it on his Comeback Stage on Music Bank in November.

[12] After finishing his military service, Haha returned as a cast of Infinite Challenge following requests from his fellow co-hosts, Yoo Jae-suk and Noh Hong-chul.

In 2012 he was also featured along with Gary, on their fellow Running Man cast member Kim Jong-kook's comeback album, "Volume 7 – Journey Home" in the song "Words I Want to Say to You".

[25] In 2014, he and Kim Jong-kook formed a musical duo, Running Man Brothers, and visited the United States for a concert tour, in July and December.

[30] In addition, he will be hosting alongside Jeong Jun-ha for a new high school rap battle show, to be aired on Mnet in 2017.

[31] In 2018, Haha had decided to resign as the CEO of Quan Entertainment and his longtime manager, Jang Hyung-chul will be taking over the position.