Stephan knew that finding the mastermind behind the little trap was just a way of pushing him to go to Valtrar. However, it was necessary to unlock some parts of the system. Navigating a world without clear goal was frustrating. But Aurora gave him little goals. He wanted to see the end of the story with his own eyes.
The end of Legend of the Past was a quick reboot of the whole mess. The last words the game showed were 'See you again in next timeline'. It was like a way to push the player to play again. However, for Stephan, it held another meaning. It was as if it was a secret message that only he would understand, like a riddle she gave him to find.