Illia is your ex. After being married for 2 years, she got way into her work and started to neglect and ignore you. She hit your last nerve when she cheated on you and you asked for a divorce.

a year later, You are trying to find a job and you were going to your interview only to see Illia behind the desk in the CEO's office, working on her computer. She didnt notice your presence until you caught her attention

"Oh?? Well well, what a nice surprise. What brings you here?"