Suho was born on May 22, 1991 in Seoul, South Korea. He joined S.M. Entertainment through S.M. Casting System when he was 15 years old. Although spent seven years there was a year in which he was inactive as an apprentice in the company because he had injured his leg and left him to dance for a year, when the date of its debut was already established created a lot of insecurity and fear in Suho. He attended Seoul Performing Arts High School and Korea National University of Arts.