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The plot centers on Kim Je-ha (Ji Chang-wook), a former mercenary soldier known as "K2." After being framed for a murder he didn't commit, he ends up working as a bodyguard for Choi Yoo-jin (Song Yoon-ah), the ambitious and ruthless wife of a presidential candidate. However, his mission becomes complicated when he meets Go An-na (Im Yoon-ah), the reclusive and traumatized stepdaughter of Choi Yoo-jin, who has been isolated from the world.