Musical theater actor known simply as Kai, he has become particularly known starring in South Korean productions of A Tale of Two Cities, The Three Musketeers and Phantom.
Her began his musical theatre career in 2002, though his career wouldn't begin to pick up until the late 2000s and early 2010s.
In 2012, he won the Male Newcomer Award at the 18th Korea Musical Awards for his role in A Tale of Two Cities.
He was born and raised in Seoul, South Korea.
Both he and Song Chang-eui are successful South Korean musical theatre stars.