Yes, just finished today because I was away.
Agree with you on many points you mentioned. Though some of the questions I have worked out my own explanation so that I can move on.
This has potential to be great, but have to say some of the scenes lack reality that I had to just close one eye on it... One eg. how could they have swam/washed up shore so quickly from the deep sea. The ship was moving very fast, so it has to be deep sea. It was so dark, how did Jin Woo (our hero) manage to find the two ladies coz the ship was moving so very fast.
The 5 days that they mentioned, with the stuff they did, was beyond me too.
I am being nitpicking for sure. A bit disappointed with the last 2 episodes, but didn't regret spending time to watch this.