Song Joong Ki

A love story that develops between a surgeon and a special forces officer. Kang Mo Yeon is a pretty and assertive woman who works as a cardiothoracic surgeon at Haesung Hospital. She isn't afraid to admit her mistakes and believes that capability overrides whatever connections you have. However, she is soon faced with the reality that she cannot advance with just capability. Her life is forever changed when she encounters Yoo Si Jin, the Captain and team leader of the Alpha Team who cares more about protecting anybody in need of help as well as his country, even if it goes against the order of his superiors. It tells the story of how they both bond together in a time of war and overcome the odds against them. (Source: AJ at MyDramaList)

Yoon Hyun Woo is a devoted, hard-working, and loyal secretary to the Soonyang chaebol family, which runs the lucrative Soonyang Group business empire, founded by Jin Yang Cheol. During a power struggle between Jin Yang Cheol's children for control of the empire, Hyun Woo is ruthlessly betrayed and killed under the orders of an unknown member of the chaebol family. Miraculously he wakes up as a kid inside the body of the youngest member of the family – Jin Do Jun. After he realizes what has happened, Yoon Hyun Wo plots to use his new “identity” to formulate a hostile takeover of the group – and punish the people who killed him. But, will the cold-blooded and money-hungry CEO of Soonyang Group, one who firmly believes in right of primogeniture, be so easy to win over or conquer? Will Hyun Woo be able to wrest the reins from Jin Yang Cheol's children? And what role will be played in all this by a dogged public prosecutor named Seo Min Young, nicknamed “Soonyang Group Grim Reaper”? (Source: LuckyGirlGwenIce at MyDramaList) ~~ Adapted from the web novel "Youngest Son of a Conglomerate" (재벌집 막내아들) by San Gyung (산경).