Yoon Je-moon

The story is set during the Joseon Dynasty when twins were considered an ominous sign. When the Crown Princess Consort gives birth to twins, an order is sent to kill the daughter. To save her, she is secretly sent out of the palace. (imdb)

The series tells the story of Yoon Hyun-woo (Song Joong-ki), a loyal higher-up employee working for chaebol Soonyang Group, who was betrayed and murdered by a member of the Soonyang family to cover up a tax evasion scheme. Hyun-woo later wakes up in 1987 discovering that he has been reincarnated into the body of Jin Do-jun, youngest grandson of the Soonyang family. Using these circumstances to his advantage, he starts his revenge by plotting a hostile takeover of Soonyang Group. - wikipedia

The crown-prince of South Korea is forced to work alongside a female North Korean military officer. Political and emotional complications lead to an uneasy marriage engagement. (imdb)

A series of murders occurred during the reign of King Sejong. As Kang Chae Yoon who is investigating these cases gets closer to the root of the truth, he finds himself embroiled in a massive conspiracy behind the serial killings which involves a group of geniuses who are willing to risk their lives for their cause/goals, and secret powers who will interfere with the course of his investigations. (imdb)

Oh Wansoo, a world-class golfer married Kim Yonggu, heir to the Hwain Group. Her life changes when she narrowly escapes an assassination attempt in Manila. She develops feelings for her bodyguard Seo Doyoon unaware of Doyoon's motivations. (imdb)