[2][3][4][5][6] In March 1972, he commenced his secondary education at Songsin High School, a minor seminary in Seoul, the capital and largest city in South Korea.
[3][4] After ordination back in South Korea, he returned to the University of Innsbruck, graduating in 1992 with a Doctor of Sacred Theology.
[3][4] Son was ordained a priest on 4 July 1986, several months after returning from his studies in the University of Innsbruck in Austria.
[3][5] In addition to teaching, Son held a variety of other offices and positions within the Archdiocese of Seoul.
[2][3][4] His episcopal ordination took place on 28 August 2015,[3][5] with Archbishop of Seoul Andrew Yeom Soo-jung serving as principal consecrator, and auxiliary bishops of Seoul Timothy Yu Gyoung-chon and Peter Chung Soon-taek serving as co-consecrators.