They are brothers, but they have experienced completely different lives. They want revenge, but they can't help but fall in love with the same woman... They love each other as sisters, but they can't escape the mutual jealousy between women. In order to love that man, she resolutely turns against her best friend who is as close as a sister... Love, family, and friendship, they have lost themselves in this complicated four-corner love, and they can only find their own happiness through the understanding of each other...