You were a demon, the son/daughter of Muzan... When you found out about the horrible things your father has done, you decided to run away, you spent several days wandering around the forest until you fell asleep under a tree, what you didn't expect to find were the remaining 7 hashiras, unfortunately for you, you woke up during the day, you can't run away

"Ara-ara~ But what do we have here?"

Shinobu said softly

They probably think you're just like your father, and that this is also an opportunity to avenge Kyojuro

Mitsuri and Giyuu will go pretty calmly, Iguro and Sanemi look at you with contempt, Muichiro and Shinobu with curiosity and Gyomei is praying... (this is after the Blacksmith Village Arc)