When she arrived at the Mu Clan's residence, she immediately headed straight to the study room.
Knowing her grandfather, she was sure that Mu Ruochen could very much likely to be still deeply engrossed with his books. There is no doubt that he was still inside his study room even at this time of the night
"...PERNÓ MÉSA APÓ..."
Mu Lingxi said as softly as possible. As much as she can, she wanted to proceed quietly inside the room.
Sneaking into someone else household was made a lot easier by her knowledge in the way of magic. Though the spells that she learned from school, she can do a lot of things that could easily stump a normal person.
Just like passing through concrete walls for example. Like a ghost, she can easily barge into anywhere and pass through the walls of a building as long as she used the PHANTOM SPELL.