The sixth Hung King wanted to find a son among his 20 children to inherit the throne because he was old and weak. Therefore, whoever pleases the king in the festival of Tien Vuong, he will pass the throne to that person.

Hearing that, the langurs ran around 5 heavens and 4 pools to find exotic gifts to bring back to their father with the hope of inheriting the throne.

Among the lang, only Lang Lieu - the eighteenth son of the 6th Hung King - is the poorest. His family only had potatoes and rice, he didn't know how to get delicious food to give to the king.

Suddenly in a dream, the mallow appeared and showed him how to make a delicious cake with simple ingredients, mainly rice. The next morning, he got up and immediately started making cakes. He then took glutinous rice, green beans and pork to make two kinds of cakes, round and square, to offer to his father.

Tien Vuong's day has also come, and the langurs are all holding exotic foods that the king's father doesn't like. Suddenly, Lang Lieu's cake stack made the king's father notice. After eating, the king found it very delicious and showed a deep meaning, so he took these two cakes to worship Heaven, Earth and the Feast of the First Kings, naming the round cake as banh day, and the Square cake as Chung cake throne for Lang Lieu.

Since then, banh chung and banh day are indispensable in Vietnamese Tet holidays.i

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