For Cheol-soo and Yeong-hee who are in 10th year of their marriage, Wednesdays are special. This Wednesday is no exception. Although they are not wealthy, they have immense love and trust towards one another. But things turn bad when Cheol-soo is laid off and Yeong-hee must relinquish her plans to buy a house. Yeong-hee is the perfect wife and mother and Cheol-soo is willing to do anything not to disappoint her. They both begin to fight for their future with everything they have. Yeong-hee runs into an old friend of hers who had a crush on her back in school. A successful businessman, Han Ji-hoon makes Yeong-hee an offer she cannot possibly refuse. Meanwhile, Cheol-soo’s new boss, Seo-lin, tries to seduce him. Another Wednesday comes by but now things are totally different from before. These two struggle by themselves with the issues of trust, fidelity and love. They ask themselves to what extent they are willing to go to save their marriage. Will they ultimately risk the thing they are trying so hard to save?