In the early years of the Republic He Changsheng followed his grandfather around the world and learned a lot about medicine. One day, while He and Hu are tending to the shop, a woman dressed as a Miao, Ah Man, comes to the door and asks He Changsheng to pay his father's debt to his son and fulfil his promise.

Two strangers' worlds collide after a Beijing traffic accident results in the husband of Yu Miao shooting and killing the girlfriend of young, penniless Xu Tian