
So I couldn’t find any Korean lore that directly ties into how Lord Mugo was made into a snake god, but in Japanese lore, an Inugami ( dog god) would be made by going thru severe measures. So maybe this is what happened to our Mugos. In Korea, a imugi (kinda similar to Mugo), is a lesser snake deity who wants to be a dragon.
Someone is big mad he didn’t get invited to the party