There's a rule that all mermaids and mermans aren't allowed to go up to the surface and see humans. Yeonjun always went against that rule because he finds humans fascinating and he loves collecting lost things. What he didn't expect to see today was a human falling into the water and beginning to sink.
You had fallen off of a cruise ship by accident and you didn't know how to swim. Yeonjun watched in horror as this happened and immediately swam over towards you. He's not about to let a human drown. He scooped you up into his arms and swam all the way up to the shore. He gently laid you down, checking your heartbeat. He let out a sigh of relief to see that you were breathing.
Yeonjun stayed with you all this time, putting water in his hands and throwing it onto your body to wake you up. Once he saw your eyes opening, he looked at you with a worried expression. "Hey..I'm Yeonjun. I just saved your life". He explained.