Sweet Spy(2005)

Sweet Spy is a South Korean series that follows Lee Sun-ae, a widowed police officer drawn into international espionage when she meets Han Yoo-il, a mysterious undercover agent. When detective Kang-Jun transfers to the Criminal Investigation Department, he reopens a cold case tied to Sun-ae's past, unraveling a dangerous web of secrets involving powerful political and economic figures. At the center of this conspiracy stands Han Yoo-il—a man whose true identity and motives remain unclear. As Sun-ae navigates between her duty as a cop and the shadowy world of espionage, she must uncover who Han Yoo-il really is and why he's entered her life. The series blends crime investigation with spy thriller elements, exploring trust, deception, and the cost of uncovering hidden truths.