Postmodern Life of the Queen's Family

Gantry Apartment, Room 614. At noon, Li Si was sitting at the computer desk concentrating on editing pictures. "Ding dong, ding dong," the doorbell rang. Who is this? It's really annoying, so ignorant, and a good idea just popped into my head. Li Si was slowly reluctant to leave his beautiful pictures. The doorbell was still ringing. Who is it? So annoying? Before Li Silin stood up, he looked at the time in the lower right corner of the computer desktop. Today was the 10th. Li Si then remembered that the 10th was the day when Sheng Bing returned home from a business trip to Tianjin. This girl Sheng Bing seems to have forgotten her key again...