The Taste of an Affair (2017)

Min-woo, the consulate general of the overseas consulate, was determined to be Japan’s next consulate. For this reason, Min-woo becomes determined to learn Japanese and lives with his wife’s friend, Mika, and learns Japanese. Min-woo’s assistant, Ji-sung, has a brief relationship with the consul general.
The more the unfamiliar is revealed, the more deeply the story of the four-way relationship becomes irreversible.