Uhm Tae Woong will be making a special appearance as the genius spy Choi Woo Hyuk in 'Level 7 Civil Servant'. The drama is set to air next January.

His casting was a top secret, known among only a few select members of the production crew. He secretly joined the film crew in Thailand and filmed past scenes for the charismatic Choi Woo Hyuk before returning to Korea.

In the drama, Choi Woo Hyuk is a genius of an industrial spy whose name and face is virtually unknown. He will continuously clash with the newbie NIS agent Han Gil Ro (played by Joo Won) as he looks to avenge his family.

Uhm Tae Woong has successfully transformed from his simple and naïve image from KBS 2TV 'Happy Sunday-1 Night 2 Days' into someone overwhelmingly charismatic as he personally picked his hairstyle and outfit to suit his character.

Uhm Tae Woong said, "I picked 'Level 7 Civil Servant' because of my loyalty to Joo Won and because the script left a deep impression on me. As the hidden card to help secure the ratings in the beginning, I plan on doing my part 200%."

'Level 7 Civil Servant' is a romantic drama about a newbie NIS agent that is lying about everything but love. This drama will air after 'I Miss You' in January 2013.