Kim jun-seo is a South Korean singer and actor. He is known for his participation in the Mnet reality competition show Boys II Planet where he ranked 8th in the final episode. gave him a place in the South Korean boy group Alpha Drive One or ALD1. Previously, he participated in the survival show Under Nineteen in 2018. He ranked 9th and then debuted with the boy vocal group 1THE9 which officially disbanded on August 8, 2020. He then joined the boy vocal group WEi as the main dancer and sub vocalist. Then Kim made his acting debut in the television series “Secret Relationships” (2025) as the main character.