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XRO (재로) is a hip hop duo under MAJOR9. They debuted on July 16th, 2020 with the digital single "Welcome to My Jungle". The duo consists of Hiro and Jaechan. Hiro was a contestant on the survival show MIXNINE, and an ex-trainee under JYP Entertainment, while Jaechan was a contestant on the second season of Produce 101.