Fitness guy turns white, grandpa

Once upon a time, there was a young man named Taro Urashima. One day he saved a turtle that was bullied by children. The tortoise said, thank you for saving me. Took Taro to the castle in the sea. There is a very beautiful and gentle princess there. Taro lives there happily every day, but he really wants to go home. When she went back, the princess put the gift in his box. But tell him never to open this box! Taro returned to land only to find that his home was gone. Passers-by told him that his home was still there 300 years ago. Taro is very sad. He opened the box and white smoke came out from it, so he became a white-haired grandfather.