Which South Korean actor appeared in both Sungkyunkwan Scanda and Secret Love Affair?
Sungkyunkwan Scandal: Sungkyunkwan Scandal () is a South Korean historical drama starring Park Min-young, Park Yoo-chun, Yoo Ah-in and Song Joong-ki. Yoo Ah-in:  Yoo Ah-in is best known for his leading roles in the coming-of-age film "Punch" (2011), melodrama "Secret Love Affair" (2014), action blockbuster "Veteran" (2015), period drama "The Throne" (2015), and the historical television series "Six Flying Dragons" (2015-2016).
Yoo Ah-in