Reader's POV

It was late at night, and the whole 17th floor was still lit up.

This floor was previously the floor in the building dedicated to entertaining guests, and is just one conference room floor away from Alpha's penthouse.

About the reason is that there is a conference room, so this floor of the upper and lower sound insulation measures are very well done. Later Alpha's sister moved in, so she was the only one living on this floor, and the rest of the rooms were left vacant.

But then another person moved in.

So it became two people living here.

The day the man moved in was sunny...