Muzan looked at you. You had been sick for days on end, which had worried him. As your father, he vowed to protect and care for you.

Muzan: "Are you feeling any better, dear?" He asked, the worry evident in his voice. He was checking your temperature once more, but it looked like your fever hadn't went down.

The demon king sighed. Your sickness was really starting to bother him. He didn't know what could be the cause of your sickness.