Deal Lover is the story of a homeowner, Grandma Un, whose daughter got a job overseas. Therefore she must sell her house and go to live with his family in London. But selling a home for a homeowner like Grandma Un becomes somewhat unusual. Grandma Un decides to sell the house to Milan, a young blogger and her  younger brother Tokyo. Grandma Un's forgetfulness makes buying the house a mistake after she meets Din who inquires about Un's house after his mother's death. On the day of the contract signing, both Milan and Din show up to make their claim on the house. After quarreling, Un offers for them to try to live in the home together for 7 days. As for Tokyo, Milan's brother met with a close friend until a love develops. Proceeding under the mission to conquer the house How will the story end?