After being found severely injured off the coast, a mysterious merman is brought to a highly classified marine rehabilitation facility disguised as a public aquarium. The staff know him only as Leon. Suspicious, stubborn, and determined to escape, Leon refuses to cooperate with anyone. Until Y/N arrives. Transferred to the facility on her first day, Y/N unexpectedly finds herself assigned as Leon’s handler. Now the newest caretaker at the aquarium must somehow earn the trust of a sarcastic merman with too many scars, too many secrets, and absolutely no intention of making her job easy. Unfortunately for Leon, healing might be easier than avoiding the feelings that come with finally trusting someone again.