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The Intruder
An infected person enters Building 101, and once again, Building 101 is under the threat of infection. Lieutenant Colonel Han enters the apartment complex with news to tell, but Sae Bom and Yi Hyun find him suspicious. A person goes missing due to the intrusion, and those with similar interests and minds stay close together.
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Other episodes for this season
![Public Rental Apartment](https://image.tmdb.org/t/p/w300/4OIry9lTCs5kJnA5ZdEonOl3Oa9.jpg)
![Thirsty Patients](https://image.tmdb.org/t/p/w300/4HDrKtRlS9eNJrkOaixe6rCVVPZ.jpg)
![Locked In](https://image.tmdb.org/t/p/w300/4YSq8n9HTx1r4MkqAxkC0mXiwp8.jpg)
![The Spread](https://image.tmdb.org/t/p/w300/bdnGdT8FcMRibfkwhGm9ACpJGQo.jpg)
![The Outsiders](https://image.tmdb.org/t/p/w300/8Y2W3WJYuMNvYLTmjVoEmAYOMOk.jpg)
![One Man’s Life](https://image.tmdb.org/t/p/w300/4mbGDNi4LCMhrvnzTLpIG4bFn3v.jpg)
![The Intruder](https://image.tmdb.org/t/p/w300/wVVKz7hC1D1DiFlXJ6AJLgZ9u6X.jpg)
![Countdown](https://image.tmdb.org/t/p/w300/rm4EsLIwx6UpgeJrT2zi13CjeGq.jpg)
![Dwindling Water](https://image.tmdb.org/t/p/w300/btW8AALfDSdj98PJOFM2OE7JQcQ.jpg)
![Kim Se Hoon Disappears](https://image.tmdb.org/t/p/w300/50VDTTcn4dNl8aRxFLTN324zXy4.jpg)
![Backup Power](https://image.tmdb.org/t/p/w300/5V2giiA1fVn42i1423MrA2P69N7.jpg)
![Happiness Is With You](https://image.tmdb.org/t/p/w300/qonWRUmpQDKKAA9plUmoA3IfwwR.jpg)