Sweet Spy

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