Nice thriller

overall nice drama with great acting. but some things were random like,
- putting all the bodies in the freezer(if it was to show that they were human, not all of them worried about food),
- the ghost(not really needed if the host was among them all the time),
- limitless 2nd floor's existence (why did they not use it? they could've easily hidden there, at least yeon-seo alone),
- Yeon-seo won when the last man standing was Jun-hee??