Seo-yun is a mudang in South Korea. In her community, she acts as an intermediary between spirits or gods and the human world through rituals, songs, and ancestor worship. Which term best describes Seo-yun?

Shaman

Explanation:

A person who is considered to be having influence in the world of spirits is called Shaman. They generally enter a trance state during rituals to practise divination and healing. They practise of changing the consciousness to interact with the spirit world is called shamanism. Seo-yun is also working as an intermediary between the gods and spirits so she is a shaman.