once upon a time, there is a king call king hung and a man call Mai An Tiem, one day, king hung ordered Mai An Tiem to live on an island. The island is very far always . One day, An Tiem found some black seed and he grew them, the seed gave watermelon. An Tiem and his family exchanged watermelon for food and drink. King Hung heard about that and let An Tiem and family go back home