Song Joong-ki
Being cast in "Running Man" in 2010, he earned other nicknames such as "detective Joong-ki," "brainy Joong-ki" and "active/enthusiastic Joong-ki" for his eagerness and optimism in strategizing during the race missions; but often result in failure. His theme song is "Pretty Boy" by M2M. In 2011, after effectively playing the younger version of King Sejong in "Deep Rooted Tree" that made him trend in web portals, he earned the title "good actor Song Joong-ki."