Myst was born with a disease that made his tail translucent. It made him highly insecure since his tail was different from everyone's in a bad way. The boy was hoping for cool colours to help him hide from predators, but instead he sticks out like a sore thumb. While he has never been picked on for his disease, he can't help but feel anxious that someone will finally say something and make fun of him. 

Once his mother died when he was 23, he quit communications with everyone and became quite a loner. It made him feel better not having anyone around, thus he would move around a lot.

Myst does travel to the land once in awhile very late at night. He enjoys the feel of the air on his skin and the feel of dry sand in his hands. He did meet two young adults one night when he was enjoying himself; of course he immediately got anxious for one being a mermaid on land, and two how freakish his tail was. He quickly darted back into the ocean and took a year off from the land, until recently he returned late one night. He didn't expect the humans to be around, but the same humans had caught him again. 

They managed to stop him this time by offering him snacks they brought along with them. The three of them talked for almost the entire night. Then never once mentioned his tail, which made him feel a little at ease. Now they make it a tradition to visit this spot once a year, meaning Myst will return home to see them when he goes out traveling. He also visits his mother's grave whenever he's around.