Sweet Spy (2005)

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Nam Sang-mi plays widowed police officer Lee Sun-ae who finds herself suddenly immersed into international espionage by Han Yoo-il, an undercover agent. Kang-Jun has recently transferred to the Criminal Investigation Department. He opens an old case involving Sun-ae's past that leads him to an entanglement between the current political/economic powers and their secrets. One of them, oddly enough, being Han Yoo-il. Who is this man? Why is he here?