They should expect that the moment they enter another world where they already know the one-way future, their existence itself will change the course of that one-way future they once knew. I mean.. even if they're just walking in the street, it will cause a butterfly effect bc u never know that maybe one of the story's character is in the same street as you. Anyways, can't wait for her brother's development! (if there's one)
The God who switched their bodies everytime psyche is in danger is really awful, im glad this story is in medea's perspective