Pororo Movie - Pororo vs Shark

Pororo and friends decided to travel in the sea, which is full of various fish friends, pretty corals and seaweeds! Besides, there's a coral playground !

Fish friends told us not to go to coral playground, but Crong and I wanted to sneak in. But...what we met there was the horrible shark! Aah! Wait! I think the shark is hiding something.

What is the secret story that the sharks want to tell us?