Kumkaew was the younger sister of Nai Hoy’s wife, Kumpang. Kumkaew was very kind, but had a strong and confident personality. She loved her sister very much. However, she did not accept Nai Hoy’s job, because he left Kumpang with her during his long journeys with the buffalo caravans. At the beginning of the story, Kumpang died of poor health and the heartbreak of missing her husband too much.

After Kumpang died, Kumkaew kept the promise that she gave to her sister – that she would take good care of Nai Hoy and would not let any girls come close with him. She hid herself to secretly join the buffalo caravans. It was too late for Nai Hoy to send Kumkaew back after he found out that she was there. After some time, Kumkaew surprised herself as she fell in love with her sister’s husband…and he also grew to fall in love with her as well…