Tracer Season 1

Yim Si-wan

Yim Si-wan (임시완), born Yim Woong-jae (임웅재), is an actor and member of the boyband ZE:A.

Son Hyun-joo

Son Hyun-joo (손현주) is a South Korean actor. He was born on June 24, 1965, and since 1991, he has starred in numerous television series and films, such as First Love (1996), To Be With You (2002), My Rosy Life (2005), Tazza (2008), My Too Perfect Sons (also known as The Sons of Sol Pharmacy House, 2009), Definitely Neighbors (2010), Secretly, Greatly (2013), and Empire of Gold (2013). Most notable in his filmography are two low-profile projects in which he played the leading role, both of which became unexpected hits: critically acclaimed revenge drama The Chaser (2012), and mystery thriller film Hide and Seek (2013).

Ko A-sung

Go Ah-sung (born 10 August 1992) is a South Korean actress. She began her career as a child actress, notably in 2006 top-grossing blockbuster The Host. This was followed by major roles in Snowpiercer (2013), Thread of Lies (2014) and Office (2015), as well as the TV dramas Master of Study (2010) and Heard It Through the Grapevine (2015).

Park Yong-woo

Park Ji-Il

Chu Sang-mi

Chu Sang-mi (추상미, born 9 May 1973) is a South Korean actress.  Her father is the late actor Chu Song-woong. She's married since 2007 with the actor Lee Suk-Joon.

Jeon Bae-soo

Kim Kuk-hee

Lee Kyu-hoe