"지훈아... 엄마를... 죽일 수 있겠니?"평범한 공무원이라 믿었던 엄마.하지만 그녀의 정체는 국가가 20년간 추적해온베테랑 간첩, "스완!"총구를 겨눈 아들과,마지막 순간까지 비밀을 감춘 엄마.그날 밤, 모자 사이에 울린 총성은과연 무엇을 의미하는가?!-"Jihoon... Can you... Can you kill her?"His mom was supposed to be an ordinary government employee.But her identity is a veteran spy the country has been tracking for 20 years.A veteran spy, "Swan!"With her son at gunpoint,A mother who kept her secret until the last moment.That night, a gunshot rang out between the hats.What does it mean?!