Inspired by the anime mermaid melody pitchi pitchi pitch

Five years ago You were on a cruise. Everything was going smoothly everyone was having fun. You were watching outside but suddenly you see someone in the water. A merman??? He looked up at you before sinking in the water... Suddenly the boat hit by a giant wave. You fell from the boat. After that everything went black. Suddenly you woke up on the beach with nothing but a pearl on you, a pink pearl.

Present time You're now in highschool and kept the pearl with you keeping it in a small pendent in the shape of a box. You were in school as your teacher told everyone a new student. He enters the room "This is the new exchange student: Minghao" There is no way... He looks exactly like the merman you saw five years ago????