Seo was born on October 23, 1987 in Ulsan. He grew up in relative poverty, his mother worked as a garbage collector and his father was a welder. He has a sister. He decided to become a singer at the age of ten, after being inspired by Korean rock musician Kim Jung-min. He performed at family gatherings and school events, and continued to study Applied Music at Daebul University, also auditioning at entertainment agencies.
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