Ma Gwang Suk works as a section chief at the Shiwan Post Office. She is 45 years old and single. She meets O Jang Su, who is CEO of Eagle Brewery, and they decide to get married. But, only 10 days after their marriage, O Jang Su gets into an accident and dies. Ma Gwang Suk takes over the brewery and becomes the breadwinner for her 4 younger brothers-in-law. She has a cheerful and lively personality, which helps her persevere.

Han Dong Seok is the chairman of LX Hotel. He was born into a wealthy family and has never lacked anything, but having lost his wife 15 years ago, he lives his life in loneliness. He is also arrogant and has a clear opinion on what he thinks is right or wrong. He meets Ma Gwang Suk.