1523 can't understand

Tan Rou shook her head, then typed on her phone for him to see, "Let's wait a bit longer and see who she is really waiting for."

Zhuang Liu nodded and continued to sit there waiting.

Tan Rou had drunk too much coffee and felt the urge to go to the bathroom, so she typed a message to Zhuang Liu and then quietly headed downstairs. Monica was focussing on her mirror and didn't notice the situation here.

Actually, there was also a restroom upstairs, but to go to that restroom, she would have had to pass by Monica's seat; Tan Rou did not want to expose herself in front of Monica just yet, so she chose to go to the first-floor restroom.

Just after Tan Rou had gone downstairs, a man came upstairs. After entering, he did not rush to find a seat but looked at each one thoroughly.

He spotted Zhuang Liu sitting by the wall and headed towards him.