Donghae and Jessica we're like siblings. That is until Jessica confesses her feelings for Donghae, Donghae can not return these feelings as he likes someone else. He leaves for Super Juniour -M the following week with not a good bye to Jessica. They slowly move apart, and become nothing as Donghae waited for Jessica to call him in Chine, and Jessica was at the same time waiting for Donghae to call her in Seoul. None, will admit they're wrongs, and about 2 years later when asked to work together , they finally start exploting what they expected of eachother.  Along the way each learns they're wrongs, and they're love for eachother will blossom again.