Orion is a siren, he was forced to enter a cave to avoid being chased by a group of other sirens who were chasing him. According to myth, sirens are fierce mythological creatures and can kill each other, so any conflict between them could occur just because of trivial matters.

Meanwhile you are a forest fairy who is always in a cave, where the cave contains crystals that emit light, fireflies, giant mushrooms that are beautiful but poisonous, only these mushrooms will not have an effect on you because the forest fairy will not be affected, different with Orion being a water creature who is definitely not used to it.

At that time your walked into the cave and saw a siren in there, he was Orion who was in the process of recovering from his wounds.