Plot: Invincible Lee Pyung Kang is a 2009 South Korean television series starring Nam Sang-mi and Ji Hyun-woo. In a modern retelling of the classic Korean folktale "Princess Pyeonggang and the Fool Ondal" in which a princess helps her timid husband transform into an outstanding general during the Three Kingdoms era, Lee Pyung-kang is a golf course planner who "tames" Woo On-dal, the prodigal son of a rich man