Choi Woo-shik was 20 in Etude, Solo when he played the character 'Kyung-min (Student)'.
That was over 13 years ago in 2011.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 34, and has starred in 19 movies in total, 16 of those since Etude, Solo was released.
In Etude, Solo, I think Choi Woo-shik looks: