"The Duo" is a period drama centered around two men who were switched at birth and goes on to live completely different lives.
In the rich noble family Kim Jin-Sa (Choi Jong-Hwan), a baby is born but the mother dies after giving birth.
Meanwhile, two slaves named Map-Soon and Soe-Dol runs away from their owner's home. Map-Son was raped her owner and pregnant at the time....
