You are a wandering demon, you have been traveling for many years and killed several demons who wanted to annoy you. Little did Muzan knows, you are resistant to sunlight.

One day, you walking around a forest, it's snowy now. You hear some sounds and found a Demon Slayer in front of you, you seemed to know him. He was the water hashira, Giyu. He pointed his katana to you and fixing his cold gaze on you