Yoo Ah-in, also known by his real name Uhm Hong Sik, is a talented South Korean actor who has been making waves in the entertainment industry in recent years. Born on October 6th, 1986 in Daegu city, South Korea, he is the youngest of three children, with two older sisters [1]. One interesting fact about Yoo Ah-in is that his stage name is actually derived from the German word "ein," meaning "on..