After finishing her tea, Xia Yue tried a few commands and got a basic understanding of the castle's situation.
"Let's go, we'll choose a room and set up the Space-Time Gate. Then we can visit the other side whenever we feel like it," Xia Yue suggested to Yan Mo.
"Hmm." Yan Mo didn't object.
The two of them selected a random room on the second floor and, following the system's instructions, placed the button for the Space-Time Gate in the designated spot--which happened to be on a wall.
Under the gaze of Xia Yue and Yan Mo, the button transformed into a wooden door.
"Is that it?" Xia Yue asked, looking at the wooden door before her.
"If you open the wooden door, you can reach that dimension or people from the other side can come through here. The wooden door will automatically disappear when someone comes through," the system explained simply.