Ryu Shi-oh is a central character in the South Korean TV series "Strong Girl Nam-soon," played by Byeon Woo-seok. He serves as the CEO of Doogo, a distribution and sales company, and plays a significant role as the main antagonist in the series. Ryu Shi-oh is depicted as a mysterious and devilishly handsome individual with an elite stature. His character is known for being ruthless and calculative, always using his intelligence to manipulate situations to his advantage. Despite his villainous role, Ryu Shi-oh exudes a certain charm and charisma that makes him an intriguing character. He is driven by revenge, especially after discovering that Gang Nam-soon, the woman he has developed feelings for, is the daughter of his enemies. Ryu Shi-oh's backstory is complex and tragic. He was an orphan taken in by Pavel, who trained him to be a ruthless killer. His childhood friend, Binbin, was killed by Pavel, an event that deeply affected Ryu and fueled his desire for independence. These experiences contribute to the depth and complexity of Ryu Shi-oh's character, making him a compelling antagonist in the series.