Marmalade Boy

Guang Xi finds her life turned upside down when her parents return from a trip to Hawaii only to tell her that they are getting a divorce. They explain that while they were there that they had met another couple, the Song Pu family, fallen in love, and now decided that each couple would break up and switch partners. Guang Xi is understandably upset. The whole situation makes no sense to her, and she doesn't want to see her family broken apart. But if that wasn't crazy enough, her parents tell her, so that she will not miss having both parents around her, that they, along with the other couple and their son, You, would be moving together into a big house making them one big happy family. Needless to say, Guang Xi is not happy about the situation at all, though she does find You to be attractive, a fact that doesn't escape the notice of her jealous friend, Yin Tai, who has liked her for years, or of Yalishi, You's ex-girlfriend. (Source: DramaWiki)