Song yi met Baekhyun‘s cousin named Kyungsoo and there comes a new world war between them. How can she be happy at Kyungsoo if he seems to do some foolish things that annoys her the most.

He suddenly came in to his Aunt‘s house then ate the food which prepared for her. He didn't even said sorry instead he annoys her more.

He called her Ms.Complicated because she has a complicated uality. He doubtfully thinks about her femininity. But Despite all, It's hard to resist the charming appeal of Do Kyungsoo.