Maid: The Woman Who

The fugitive hides in the basement of a wealthy house where his wife works as a housekeeper to avoid debtors. Min-ho, a very successful businessman in the construction field, pokes at a new housekeeper, and his wife, who resents her husband for neglecting her, goes to find a fugitive living in the basement. The interlaced sex of two couples who gradually cross the water level.
How far will their narrowly dangerous tightrope go?