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.

[4][5] Go made his big screen debut as a drug crime officer in 2004's Some, in which he performed his own stunts and was later recognized as Best New Actor at the Grand Bell Awards.

[8][9] Then in the romantic comedy Marrying a Millionaire, Go played a delivery man who is asked by a TV producer to act like a rich bachelor to attract several women on a televised reality dating show.

"[13] Go then made his television comeback in the melodrama Will It Snow for Christmas?, a tale of rekindled childhood love penned by renowned TV writer Lee Kyung-hee.

[26][27] Later that year, he starred in melodrama film Way Back Home, playing the devastated husband of a woman wrongfully accused of drug smuggling.

Go said the reason he chose the film was because he wanted to work with acclaimed actress Jeon Do-yeon, and that through his character he "was able to tackle the challenge of internal and external change".

Directed by Kang Je-gyu, Awaiting is about a married couple separated for sixty years by the division of North and South Korea.

[35][36] Go made his small screen comeback after three years in MBC's 55th-founding anniversary historical drama directed by a famed director Lee Byung-hoon, The Flower in Prison.

[38][39] The same year, Go starred in The Tooth and the Nail, a film based on the 1955 mystery novel by Bill S. Ballinger in which a magician discovers the incinerated teeth and fingernails of his missing butler.