My Marvellous Dream is You follows Dawan and Kim, two women haunted by the same dream—visions of a mysterious girl they believe is their destined love. What they don’t realize is that the girl has been beside them all along. From school years to adulthood, their bond deepens into unspoken love. As they navigate careers, ambition, and the echoes of their past, one question remains: will they finally awaken from the dream and step into love… or continue chasing each other in the endless world of their dreams?