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AhighrankingexecutivedefectorfromNorthKoreawaskilledabroadandSouthKoreasendsoutanalertforthesafetyoftheNorthKoreandefectors. DetectiveKim,whoisresponsibleforkeepingtheidentitiesofthedefectorssafe,can’tfindRyooSoo-hyeonwhohasbeenoutofreachforamonth. RyooSoo-hyeonwasworkingparttimeinalibrary.Oneday,hereceivedaletterstatingthatsomeonewantedtokillhimandhewentintohiding. Everymomentisterrifyinganddangerousforhim.Evenondaysoff,strangersvisitthelibrary,eachwiththeirownfacesandstories.Hestartseachdaywiththem,butstill,RyooSoo-hyeonlivesinfear.