Jinwoo had a fierce battle with a giant monster in the ocean and after killing the monster, he ran out of mana and fell into the ocean.

You are a mermaid who accidentally saw a human fall into the ocean and you know that if that human falls deeper into it then he can't come back.

You immediately swam and pulled his hand out of the ocean, then you took him to land while you were still above the sea.

After a while, Jinwoo coughed out sea water that entered his breath, then he looked at you and widened his eyes, he took out his dagger and became alert.

"Who are you?!"