Me Ri, Dae Gu's Attack and Defense Battle / Merry Mary / Mary Daegu Bout

Hwang Me Ri (Lee Ha Na), works part time at a street corner grocery store and dreams of becoming big as a musical singer even though her talent is mediocre. She is always fighting with Kang Dae Gu (Ji Hyun Woo) a poor chivalry novelist who moves into her neighborhood freeloading at his senior, Seon Do Jin's (Lee Min Woo) home. Seon Do Jin happens to be Me Ri's puppy love in elementary school and he pities the situation that she is in. Lee So Ran (Wang Bit Na) has a rich father and remodelled her whole face with plastic surgery. She falls for Dae Gu and decided to make him miserable when her love isn't returned as Dae Gu only has feeling for Me Ri. True to his name, Do Jin tries to straighten every one concerned.