Xia Siyu was indeed groggy from sleep.
She had flown all the way from China, certainly not getting any proper rest on the plane. After all the exhausting travel, transfers, and car rides, she had to deal with the program crew's cameras and the other five guests, particularly the troublemakers Shang Feifei and Li Yiru.
In addition, everyone suffers from jet lag; she had only managed to lie in bed until two o'clock before falling asleep, and now her brain hadn't even had time to recover.
When she came downstairs and saw Bo Yan, perhaps because she had been living with Bo Yan recently, or maybe because her head was still a bit foggy, she didn't realize that this was happening during the filming of the show, nor did she remember that they weren't in China.
