Song was born in Taiwan, but later emigrated with his family to the UK at the age of 11. After becoming a Christian at the age of twenty-one, Song began volunteering in international student outreach in Sheffield where he lived at the time. Song later married a fellow volunteer (who mistook him for an international student at first meeting). In 2012, Julia (his wife) and he moved back to Taiwan for two years and were involved with student ministry there. Since being back in the UK, Song has been involved in various international student outreach ministries and is currently studying for an MA in Theology at Oak Hill College.
In his spare time, Song enjoys wrestling with his 3 and 1 year old boys (because at the moment victory is still guaranteed) as well as reading, climbing and going to the gym.