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Invincible Lee Pyung Kang is based on a Korean old tale of 'Ondal and Pyung Kang princess'. Lee Pyung Kang's (Nam Sang Mi) father unfortunately met with an untimely death before completing his ambitious work. Pyung Kang came to terms with the reality as she supports the family. Eight years later, Pyung Kang who wanted to follow in her father’s footsteps to become a golf course designer, she does chores at a resort town where she meets Ohn Dal (Ji Hyun Woo), the owner’s eldest son.