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Two men with the same name work for the same company and are involved with the same girl. One is her husband and the other is her superior. Best Partner focuses on the life of Japan's corporate 30-somethings and the rivalry for success that encompasses their lives. Unbeknownst to each other, Suzuki Ichiro and Suzuki Ichiro both work for the same publishing firm in Tokyo. The only difference in their names is two strokes in the kanji character of their first names. Ichiro #1 marries his coworker, Hayama Asuka. Ichiro #2, who is Asuka's superior, attends the wedding reception and the two Ichiros meet for the very first time. But seeing how close his new wife and her superior seem to be, Ichiro #1 begins to feel anxious about the future

the film centers on a reckless police inspector bent on bringing a major gold smuggling scheme to its end.

Based on the real story of Shin Jae-Hyo and Chae-Sun. In 1867, Shin Jae-Hyo (Ryoo Seung-Ryong) leads the Dongrijungsa which teaches pansori (traditional Korean musical storytelling). A young girl, Chae-Sun (Bae Suzy), who wants to perform pansori, appears in front of him. Chae-Sun has dreamed of performing pansori since she first heard Shin Jae-Hyo perform when she was little, but Shin Jae-Hyo turns her down because women are not allowed to perform pansori. Chae-Sun then disguises herself as a man and enters the Dongrijungsa to learn pansori, but Shin Jae-Hyo doesn't accept her as his student. One day, he hears Daewongun (Kim Nam-Gil), the most powerful man in Joseon and the father of the King, is going to hold a national competition of pansori performers known as “Naksungyeon.” Shin Jae-Hyo decides to teach Chae-Sun who has a true voice to perform “Chunhyangga.” If anyone finds out that Chae-Sun is a woman, Shin Jae-Hyo and Chae-Sun will both face death.

The drama tells the story of two men who were switched at birth. A twist of fate results in Chun Doong, who is of noble birth, living his life as a slave and later becoming a heroic outlaw, while Gwi Dong was born as a beggar but lives Chun Dong's life as a nobleman, growing up to become a police chief. They both fall in love with the same girl, Dong Nyeo.