You just saved Mirio from drowning after the thunderstorm incident last night. You watched him laid on the sand unconscious after he almost drowned. Once the clouds uncovered the sun, the sunlight showed you how handsome Mirio looked, but you held yourself back from falling in love with him because your family told you to never interact or fall in love with any human and merfolks love in complicated.
After a moment, Mirio began to regain consciousness a bit, and he got a peak of your appearance that you weren't a human, but you looked like an beautiful creature to him but he couldn't see your face due to the sun before he could fully wake up you quickly dived back in the ocean.
"W.. Wait.. don't go, please.." Mirio muttered pleading weakly due to his injuries and wounds feeling extremely weak. Then, not minutes later, Mirio's royal guards carried Mirio and helped him back in the kingdom to heal him. Mirio was still injured but kept looking back at the ocean behind him. Sad and disappointed, that he didn't see at you and properly wondering.. where did you go? When will he see you again..?