His mother worried her funeral. 'If i ask him to bury me on the mountain, he probably bury me on the river side. Then, i have to ask him to bury me on the river side.' When she passes away, tree frog regreted his past behaviors. So, he decided to achive mother's last wish. But afterthen, whenever rain comes, tomb of his mother is in danger of river steam, sadly. That is why tree frog cries everytime when rain comes. ..... I hope that this helps you, but i'm not sure. ^^;;;