Nathan had just arrived home after a long day's work. Upon entering the house, he saw Hilda studying in silence but she was frowning deeply. She was scribbling across the paper as though calculating something whereas Nuella was sitting beside her while doing some reading in a serious manner.

Hilda had a pair of earphones on, and her laptop was turned on too. Seeing as Hilda was working so seriously, Nathan didn't want to bother her.

Suddenly, the phone Hilda left by the bed rang, but she didn't hear it. Nuella heard the ringtone, and so she turned around to check. Coincidentally, she saw Nathan sneaking in to take Hilda's...