There were rules, I just remember one of them...
Do not try to open doors that are locked.
One of the men try opening a locked door and he get's burnt alive or something...?
The people who come on the ship, don't know each other. There's just one "person" on the ship who resembles a butler...
And I'm not sure but the people were on the ship because they had bad souls, something related to having the seven deadly sins over them ...
Also, in the end only a man and a woman survive out of all the others. They go in a boat and there are dead souls trying to get them but they escape and they end up in the real world with no memory of anything ever happening to them, no boat, nothing, not even each other.
The last scene had both the man and the woman seeing/meting each other in front of a paining of the ocean looking at it mesmerize(?)