To celebrate the National Children's Day the Thai Post issued a series of commemorative stamps depicting characters from the traditional Thai literature narrative Khun Change-Khun Phaen.
Khun Chang-Khun Phaen is about a love triangle between one woman (Wanthong) and two men (Khun Chang-Khun Phaen). It is believed to be based on a true story from the Ayutthaya Period. It's assumed that the origins of the narrative lay in the beginning of the Khum Hai Karn Chao Krung Kao Chronicle (The Chronicle of the Statements Made by the Inhabitants of the Ancient Capital). These three characters were from Suphan Buri. Wanthong and Khun Phaen were involved in a secret love affair and they were not yet married when Khun Phaen was conscripted for war. Khun Chang made every attempt to win. Wanthong was his wife but on returning from the war, Khun Phaen took her away from Khun Chang, who went in search of her only to be hurt by Khun Phaen. A plan was to track them down and, after their arrest, Wanthong was executed for her indecisive love for two men.