thank youuuuuu for updating it, its really such a cute comic with one of the best art styles ever.
Anastasia is an actual thing (a failed weapon) and everyone that was involved in it was killed. The room is not Anastasia, it just has the blue prints of it written in glow in the dark ink which is why the light was on at all times.
OH MY GOD FINALLY A MANHWA THAT GIVES A SATISFYING CONCLUSION TO EACH PERSON