Yoon Jin Ah has been dumped by men many times because of her clumsy, reckless and foolish behavior. Joon Hee is Jin Ah's childhood best friend's younger brother, who used to live next door. Jin Ah has always remembered him as a little kid, but one day, he comes back as a really masculine man. When she is surprised by his change, her gut feeling tells her that she will truly fall in love this time.