ok so this is my interpretation of the teaser. 1. Donghae the rich guy was best friends with Eunhyuk the poor guy orphan with no money and struggles to make a living. 2. Eunhyuk bought some flowers with the little he has for Donghae to confess his feelings for him but realized that he had a girlfriend and saw them together. 3. Eunhyuk ran around feeling growing pains. 4. Slowly Donghae drove around in his fancy car and slowly realizes that he had feelings for Eunhyuk, but still likes his girl. 5. Turns out that the girl was actually Eunhyuk in disguise because he's sexy like that.