Yim Si-wan, known mononymously as Siwan, is a South Korean singer and actor. He is a member of the South Korean boy band ZE:A and its sub-group ZE:A Five. As an actor, he is best known for starring in the films The Attorney (2013), and the cable series Misaeng: Incomplete Life (2014), which were both successful at the box office and in the ratings. In addition, he was selected by the Korean Film Council as one of the 200 Korean actors that best represent the present and future of Korea's movie scene.

The Attorney is a 2013 South Korean legal drama film co-written and directed by Yang Woo-suk.