Question: Go Soo, also known as Ko Soo, is a South Korean actor, and has appeared in films such as which 2009 South Korean mystery thriller starring Han Suk-kyu, Son Ye-jin and Go Soo?

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Will It Snow for Christmas?: Will It Snow for Christmas?  () is a South Korean television melodrama series starring Go Soo, Han Ye-seul, Song Jong-ho, Sunwoo Sun, and Jo Min-su.  It aired on SBS from December 2, 2009 to January 28, 2010 on Wednesdays and Thursdays at 21:55 for 16 episodes.

The Contact (1997 South Korean film): The Contact () is a 1997 South Korean romance film directed by Chang Yoon-hyun.  Starring Han Suk-kyu and Jeon Do-yeon, it was the second biggest-grossing Korean film of 1997 with 674,933 admissions, and was awarded the Grand Bell Awards for best picture.

Flowers of the Prison: Flowers of the Prison () is a 2016 South Korean television series starring Jin Se-yeon, Go Soo, Kim Mi-sook, Jung Joon-ho, Park Joo-mi, Yoon Joo-hee, , Jun Kwang-ryul and Choi Tae-joon.  It is MBC's special project drama to commemorate the network's 55th-founding anniversary.  The drama also marks the 3rd time collaboration between director Lee Byung-hoon and writer Choi Wan-kyu, after "Hur Jun" and "Sangdo".  It replaced "Marriage Contract" and aired on MBC every Saturdays and Sundays at 22:00 (KST) for 51 episodes from April 30 to November 6, 2016.

White Night (film): White Night (; lit.  "White Night: Walking Through White Darkness") is a 2009 South Korean mystery thriller starring Han Suk-kyu, Son Ye-jin and Go Soo.  It was based on the Japanese novel "Journey Under the Midnight Sun" by Keigo Higashino.

Way Back Home (2013 film): Way Back Home () is a 2013 South Korean drama film starring Jeon Do-yeon and Go Soo, and directed by Bang Eun-jin.  It is based on the true story of an ordinary Korean housewife who was imprisoned in Martinique for two years after being wrongfully accused of drug smuggling at a Paris airport.

The Royal Tailor: The Royal Tailor () is a 2014 South Korean period film directed by Lee Won-suk, and starring Han Suk-kyu, Go Soo, Park Shin-hye and Yoo Yeon-seok.  It tells the story of a rivalry between two tailors at the Sanguiwon, where the attire worn by royalty were made during the Joseon era, plunges the court into scandal and tragedy.  The film was released in South Korea on December 24, 2014.

Love 911: Love 911 (; lit.  "Bandage" or "Band-Aid") is a 2012 South Korean film starring Go Soo and Han Hyo-joo about an unlikely romance between a dedicated firefighter with a painful past and a cold-hearted doctor who is solely focused on her career.  It was released in theaters on December 19, 2012.

Empire of Gold: Empire of Gold () is a 2013 South Korean television series starring Go Soo, Lee Yo-won, and Son Hyun-joo.  It aired on SBS from July 1 to September 17, 2013 on Mondays and Tuesdays at 21:55 for 24 episodes.

Romantic Doctor, Teacher Kim: Romantic Doctor, Teacher Kim () is a 2016 South Korean television drama starring Han Suk-kyu as the title character with Yoo Yeon-seok and Seo Hyun-jin.  It aired on SBS every Mondays and Tuesdays at 22:00 (KST) for 20 episodes from November 7, 2016 to January 16, 2017.

Go Soo: Go Soo (born October 4, 1978), also known as Ko Soo, is a South Korean actor.  He has appeared in television series such as "Piano", "Green Rose" and "Will It Snow for Christmas? ", as well as the films "White Night" and "The Front Line".

Supporting paragraphs: Go Soo White Night (film)
Answer: White Night