
Until now I don't understand anything

So basically there are two actors who are getting ready for a role but in order to fully get into character, they've determined that they should live together like the characters did. By dating, they experience what their characters experienced and can then play their parts better. The white-haired actor can read people's minds except for the mind of Mogyeom (the other actor). Mogyeom also has PTSD because when he was little someone attacked him so he can't remember the other actor who he acted with before the trauma. I hope this helped.
But the chapter is too short, I was waiting for these