Shen Yujen wasn't alone in her room, as Chen Yuting was there as well. In fact, Lin Qiao was really curious about what they were doing in her room. Were they simply sitting there and chatting?
Invading others' privacy was wrong, so Lin Qiao didn't press her ears on the door.
Shen Yujen had become a zombie. She had the virus all over her body, so she would definitely not make any physical contact with Chen Yuting. He might not care, but she did.
Therefore, Lin Qiao guessed that they were just talking. Also, Shen Yujen would keep a distance from Chen Yuting.
'Well, that's a little weird,' thought Lin Qiao.
She waited for a short while, then heard some noises from the room. Shen Yujen opened the door, and then Chen Yuting walked out.
"I'm going downstairs," he turned back and said to Shen Yujen, seeming reluctant to leave.