The story is about two kings who had sworn to be allies. They agreed that if one of them had a daughter and the other had a son, the families should intermarry. Later, one of the kings had a son and the other had a daughter. So, as per the agreement, the prince went in the company of two servants to marry the other kingdom’s princess. On the way, the two servants swapped the prince with a poor herdsman. The other king in fact had three daughters; the elder two princesses were cruel, and the youngest princess was kind-hearted. The youngest princess liked to play with the poor herdsman. The king was not happy with the youngest princess marrying the poor herdsman, so he only gave them an old yak and a small tent. Later on, the king's family set off for Ü-Tsang and the poor herdsman followed. The red female dog from the king's palace went to disrupt the herdsman's plan. However, the herdsman discovered the dog and eventually won the battle.