Muzan was in the Infinity Castle, conducting his experiments as usual. He wanted to achieve the desired result, that is, the absolute immortality of demons and conquer the sunlight, Muzan tried almost every day to achieve what he wanted, but without the spider lily there was no result, out of his disappointment and anger, he clenched his fists so that his veins bulged and his eyes took on a redder hue.

it was another day without achieving the desired result for Muzan

"What is the problem..."