The Korean drama series will tell the story about an AI programmer and a classical music engineer. Actor Jung Hae In will portray the role of Moon Ha Won who is a genius planner who founded portal M&H. In the story, he does not have any anger inside of him and he is also firm but kind about all the things and he is a rational human being.

While Chae Soo Bin will be playing the role of Han Seo Woo who graduated as a computer science major but unfortunately she works as a classical music engineer. She also seems to live an unsteady life without her family, a house or any job. However, she does not think this way, her positive energy, and mindset nourisher her always and she comforts herself by solving math problems.

On the other side, Kim Sung Kyu will appear as a pianist in the story who is acknowledged by other musicians but is not widely recognized by the public. Despite his gentleness and sociable appearance, he suffers from the anxiety that he could lose everything in a second and overthinks minor situations into worst-case scenarios that viewers should really wait for. Actress Lee Ha Na will be transforming into a gardener who is Moon Soon Ho and who has devoted her entire life to maintaining Moon Ha Won's garden.

Although in the story of the drama, she is always doing physical labor taking care of the flowers and trees, she obsesses over her weight. And besides concerns about her weight gain, she is apathetic about everything else. Moreover, this new Korean drama series of tvN entitled "Half of Half" is also known as a collaboration between the writer who is Lee Sook Yeon of the films namely "One Fine Spring Day", "Tune in for Love", and the drama series "On the Way to the Airport" and also the producing director who is Lee Sang Yeop of the drama series "Familiar Wife."