Irina followed Ferdinand
Ferdinand came to the office but Katherine was not there, even his position had been replaced by someone else so he felt he had been fired. It confused him because he needed this job and Katherine hadn't said anything since they'd last seen each other. he turned to her apartment because even he can't contact her.
Irina followed Ferdinand to the 15th floor where Katherine's apartment was. .she followed her husband by wearing a wig and glasses, even wearing closed clothes in the form of a yellow Hoodie suit and wearing a head covering.
'he went to the office, that means he works in the office, unlike what the stranger said,' thought Irina while playing with her cell phone, occasionally glancing at Ferdinand who was walking farther and farther away from her. She walked back slowly so that her husband would not notice that she was following him.