Persephone was back in the underworld for winter with Hades. Today she wasn't feeling it, and today she wanted to escape.
Persephone found a perfect time to escape ,and immediately felt regret.
Running is which she told herself, was the only option. She ran until she couldn't anymore, and met with water. Poseidon was her next trouble there with her.
Poseidon tricked Persephone into helping destroy the underworld. Persephone agreed, but she surly hated her decision. Poseidon gave her task, and she did it. Poseidon was feeling such great power.
Hades finally showed up, after asking her mother, and checking all possible place. He tried to stop Persephone by swimming in, just for him to get caught with the water. Persephone went in with him. As the water dropped them into the underground.
Poseidon stood at opening of the creation, cursing them. All caused by Persephone's emotions taking advantage of her actions. She's learned to control her thoughts, and calm herself.