My sister in law (Ever Since We Love (2015)

Beautiful Nina lives happily married, as she saw it, with intelligent Alexandr, professor of Sinology. But the debt for the mortgage begins to disturb the relationship of spouses. One day she meets Sergey, the head of the bank where her husband has debt, and so begins their passionate relationships. The story of the relationship with married Sergey hardly promises happiness, but Nina realizes that for the first time she feels true love.