He was originally a snake, but because he accidentally swallowed a pearl of an enlightened monk, he could turn into a human. He is living for 300 years and very skillfully integrates into human life without Whoever discovers his identity, normally he will be in a human body for ease of living, but when the moon is full he will be very difficult to control and will turn back into a big snake. He can turn into a human or a snake as he pleases as long as it's not a full moon that night.