(짝패)is a February 7, 2011 -- May 24, 2011 TV series directed by Lim Tae-Woo,
"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. In a beggar's hut, Map-Soon gives birth to a male baby.
To feed the baby of Kim Jin-Sa, servants look for a woman who can breastfeed. Finally, they come to the beggars' hut and take Map-Soon away - saying she can come back after breastfeeding the baby of Kim Jin-Sa. Days pass, but Map-Soon is not able to leave. She stays at Kim Jin-Sa's home and works as a nanny.
One day, Map-Soon switches babies to raise her birth son by herself. Chun-Dong ( Chun Jung-Myung ), who was born in the rich noble family, grows up in the poor beggars' hut. Gwi-Dong ( Lee Sang-Yun ), who was born in the beggars' hut, now grows up in the rich noble family.