Here's a Korean folktale.

A brother and a sister became the moon and the sun.
M : Mother
B : Brother
S : Sister
T : Tiger

A long time ago, there lived a mother and her two children. One day the mother went to work.
M : Mommy will go to work.
B : Bye mom.

The mother was coming back home. She did not know that a tiger was following her.
There, the tiger appeared!So, he ate the mother.
T : Hello! You know, I’m very hungry. I will eat you.
M : Ah~~~~~~~~~~~~.

The tiger killed the mother, went to the house, and pretended to be the children’s mother.
T : Children, I’m home. Open the door.
S : Mommy.
B : Wait! It’s not her voice, we should check.

The children realized that it was a tiger so they ran away.
They climbed to top of the tree. The tiger kept searching.
B : That’s a tiger. Ouch, my eyes.
B : We must run away!
T : Where are they?

The tiger saw their shadow in the pond.
T : Huhuhu… there you are. How did you go up there?
S : How? Use the a~!!
B : Put oil on your foot.
T : Oh,yeah?? I’ll be right back kids~!!I can’t go up there. What’s wrong?

The girl thought the tiger was very funny so she told him how to climb.
The tiger started climbing.
S : Hahaha you fool! Use the ax!
T : Oh! That’s right. Thank you.
S : Oh I’m sorry. What should we do!
B : God! Please help. Give us rope if you want to save us.

The children prayed and the rope came down. They went up to the sky. When the tiger saw that the children were climbing the rope, he also prayed.
T : God! One more rope please! Hahaha…Thank you!

The tiger went up into the sky. But, actually the tiger’s rope was a frayed rope. The bad tiger fall to the ground and died.
Finally, the sister became the sun to light the day and the brother became the moon to light the dark, so they lived happily ever after.