The Invited Man (2017)

Synopsis:

One day, Eun-kyeong gets sex toys at work. She doesn’t like them at first but she can’t get over the great feeling from the massage shop and starts touching herself. Min-ho sees this and he gets horny. In the end, they have sex that they will never forget.

Since then, Eun-kyeong opens up to sex and that’s when her husband’s handsome friend Sang-wook appears. Eun-kyeong feels electrocuted even with the slightest touch by him and Min-ho starts to realize there’s something going on…