Kim Tae Hee comes from a wealthy background and was always deeply loved by her family. However, she hated to be with the rich people as she had always thought of them as spoilt, rich brats. In the poorer district of the town, there was this boy named Kyungsoo otherwise known as D.O. He comes from a poorer background and has very little friends since he couldn't really trust anyone in the same district as him due to some reasons. He only has 11 other friends which he treat as brothers rather than just friends. One day, Tae Hee went out of her house to the poorer district for a walk and there, she met Kyungsoo for the first time.