How To Live on Earth (2008)

A woman from another world encounters her alien husband, and his government assassin wife is tasked with eliminating her. The wife, a deep undercover agent guarding national secrets, views her poet husband as an outsider. He carries a key within his mind, while she holds a weapon. The alien woman possesses a profound, deliberate love. This complicated situation escalates as a sinister force emerges, revealing its true form and beginning a series of killings.