Han Joon Oh is a leading South Korean celebrity. He is stunningly good-looking and tall but is secretly plagued by an inferiority complex that leaves him permanently insecure. One day, he is hired to appear in a public service video. But the shoot goes horribly wrong, and Han Joon Oh is involved in a potentially fatal car collision. He is only saved by the quick thinking of a female firefighter named Kang Young Hwa, who pulls off a heroic rescue.Han Joon Oh’s representatives hire Kang Young Hwa to work as the star’s personal bodyguard, recognizing her incredible talents. But when Han Joon Oh awakes from his stupor in the hospital, he has changed completely – as his body has now been possessed by the spirit of a nobleman from ancient Korea