AJ

Introduction

AJ, also known as Siyoon, is a South Korean singer-songwriter, rapper, and producer under Rooftop Company. He is a member of the boy group U-KISS and a former member of Paran.

In 2011, AJ was added to U-KISS along with Hoon. He also became a member of the group's sub-unit 'uBEAT with Kevin and Eli.

In July 2012, AJ announced he would be going on hiatus from group activities to study after being accepted at Columbia University. However, he officially left the group in 2016 but has rejoined as of 2023 to participate in the group's 15th-anniversary comeback.