Yujeong,whoworksasanightshiftnurseatageneralhospital'scardiologydepartment,isnowtoldthather12th-gradeyoungersister,Kijeong,hasbeenarrestedbythepoliceasasuspectinaninfantabandonmentcase.OnlythendoesYujeongstarttomakedesperateeffortstorescuehersistereee