Jkaji (also known as 24 Flakko or 24 Jay Jay) is a rapper, singer, and actor from Seoul, Korea. After living in Atlanta, Georgia and immersing himself in the trap scene, he dropped his first album ATLANTA in 2018. The album featured rappers like 21 Savage, Lotto Savage, and Notoriou5 Bino. 

Returning to Korea, he elevated his rap career and pioneered the fusion of trap elements into Korean hip hop alongside artists like Swings, Nafla, Choiza, Killagramz, Deepflow, BLOO, Loopy, Don Mills, and more. Transitioning to R&B with his soulful single "Enticing" under the name Xbf in 2019, he continued to captivate audiences with his melancholic R&B releases. In June 2023, he returned as 24 Flakko with LOTTO Part I and LOTTO Part II under Warner Music Korea.

In his debut acting role, 24 Flakko portrayed Je-hoon in the road film Cabriolet, sharing the screen with Korean actors Keum Sae-rok and Ryu Kyung-soo. Directed by Cho Kwang-jin, known as the original author of the critically acclaimed Itaewon Class, the film premiered theatrically on June 19, 2024.

On July 5, 2024, 24 Flakko dropped his single “KARDASHIAN” on various streamlining platforms. Its accompanying music video surpassed 100,000 YouTube views in less than 48 hours. The song’s catchy melody mixes both vocals and rap, showcasing 24 Flakko’s versatility as a singer-rapper.

Under his new moniker Jkaji, he released the mini-album “222” on October 17, 2025, inspired by the rebirth of Player 222 from Squid Game. Much like the character’s transformation, Jkaji marks a new chapter in his artistic journey, signaling a bold shift toward a new hip-hop–driven sound.