[5] Song was born on February 18, 1985; his mother, a devout Christian, named him after Jesus's Second Coming ("Jae-rim" in Korean).

[2][6] His family was poor, so much so that it was not affected by the 1997 Asian financial crisis, and Song began working part-time at a young age,[7] modeling to pay for college tuition.

[13] His notable roles include a loyal bodyguard in the period drama Moon Embracing the Sun (2012),[14] and a cold-blooded assassin in Two Weeks (2013).

[16] Wanting a change of environment, in early 2024 he turned to theater for the first time, appearing in the Korean adaptation of Samuel Adamson's Wife.

[17] His final role was in the Korean musical adaption of La Rose De Versailles, based on the manga series by Riyoko Ikeda.