Jang Do Yoon, known as Do Yoon, is a South Korean singer, model, and actor. He was going to be a trainee of Pledis Entertainment's boy group "Seventeen", but decided to pursue a career in acting instead. Do Yoon appeared in music video’s ‘Wonder Boy’ (After School Blue), ‘Love Letter’ (Happy Pledis), ‘Face’ (NU’EST), and ‘Venus’ (Hello Venus) ...