‘Gangwon-do’ consists of two irregularly intersecting stories happening in winter, in Gangwon province. A young man who is about to join the military travels from Cheolwon to Sokcho in search of his father. In the meantime, a woman who has escaped from her oppressive husband returns to her home village with the help of a kind stranger. Stories of these two characters, traveling in the opposite direction within the same spaces, unfold mysteriously.
After his uncle's unjust takeover of the family company, Kang Min Ho grows up to be a successful, if not cynical investor who only cares about money. But when he undergoes a sudden heart transplant surgery, Min Ho literally has a change of heart when he inherits a warm and compassionate heart. In the midst of seeing the world anew, including falling for the kind Kim Soon Jung, Min Ho must mitigate his newfound personality with the demands of his cutthroat career.