![](https://image.tmdb.org/t/p/original/mFke3iH2cyiMzF2D4U0h6ZGXYc1.jpg)
![](https://image.tmdb.org/t/p/w342/fFT0IgqtCOks4munDTxQwkvNJkd.jpg)
Key to Salvation
E2, Ryu Tae-suk and the samples go missing. Seeing a familiar name on the intruder, Ji-an follows her down the vents for answers.
![](https://image.tmdb.org/t/p/w300/9hNJ3fvIVd4WE3rU1Us2awoTpgM.jpg)
![](https://image.tmdb.org/t/p/w300/dYKGIEIuHg0RFHOIt3JXbT55mK0.jpg)
![](https://image.tmdb.org/t/p/w300/AgpSZkX9j9xlrQ2NdVe6E2CvFJf.jpg)
![](https://image.tmdb.org/t/p/w300/flveDYeIpRH29kyBLbxWRdoLhLn.jpg)
Other episodes for this season
![Balhae Lunar Research Station](https://image.tmdb.org/t/p/w300/AiSVPSESh2Lh0POMkYOXhTKpy3W.jpg)
![Three Storages](https://image.tmdb.org/t/p/w300/2C4oSTUBaVrd7rdDaEOKVTzrmOv.jpg)
![Cause of Death](https://image.tmdb.org/t/p/w300/uO4afuUS12EaRPg68cupS7R7Aqs.jpg)
![The Truth Comes Out](https://image.tmdb.org/t/p/w300/r8rXt6uoXDuPo8swEmAgQLxEe5U.jpg)
![Secret Storage](https://image.tmdb.org/t/p/w300/vQlmlHXag1AXDSN9aMW7YRFqNfX.jpg)
![Key to Salvation](https://image.tmdb.org/t/p/w300/mFke3iH2cyiMzF2D4U0h6ZGXYc1.jpg)
![Luna](https://image.tmdb.org/t/p/w300/yCXp0DJlBfq42aXkdL87hHo7yCT.jpg)
![The Silent Sea](https://image.tmdb.org/t/p/w300/tIjYWJkEtIl2ZrfUdAP0cNXhjiJ.jpg)
E2, Ryu Tae-suk and the samples go missing. Seeing a familiar name on the intruder, Ji-an follows her down the vents for answers.