The married woman who works as a mediator is actually a former beautiful homeroom teacher! 7 VOSS-163

As usual, he played pachinko until he was broke. To change his mood, he sought out a married woman who worked as a prostitute. Upon closer inspection, he discovered that she was actually his beautiful former homeroom teacher. This unexpected reunion rekindled all the resentment from years ago, and he began plotting how to get revenge!