Son was born on July 8th 1992 in Chuncheon, South Korea. He was taught by his father, who was a football player. He graduated Chuncheon Buan Elementary School. Then he entered Chuncheon Hupyeong Middle School, butl he transferred to and graduated from Wonju Yukmingwan Middle School. He entered Dongbuk High School, but quit to join Hamburger SV.