Mussen and Tina's studio is located in the basement of this building.
Unlike other areas of the mansion, this place is locked. The key is usually kept by Olson himself, and only handed over to Housekeeper Dennis when he goes out.
Fortunately, Pello ran into Dennis tonight; otherwise, he would have had to put in more effort to successfully enter the basement.
Since Olson Manor is situated on undulating terrain, the villas are built on high ground. Thus, even though it is a basement, in reality, it is equivalent to the first floor of a civil dwelling, and with the villa on the left facing the sunshine, without any tall trees around to block, even on cold nights the basement still retains the scent of afternoon sunshine. This is also the reason why Tina, who knows how to enjoy life, chose the basement as her studio.