Devil in the Church

It was 6 AM in the morning. 

A young nun opened the door of the church and walked in. She walked to the altar and lit some essence candles. Then, she cleaned the altar with a wet, clean cloth and knelt down.

After praying for ten minutes, she turned around and saw someone sitting in the fourth row.

It was Leon.

He was sitting with his head dropped and his gaze focused between his legs. His mask was still on, and his head was covered with a hood.

The nun was surprised to see him sitting, but she wasn't scared.

The nun gathered up the courage and reluctantly asked, "Are… Are you here for prayer?"

Leon didn't reply and raised his head to look at the nun.

"Why are you here?" Leon asked the nun.

"It's my duty to clean everything in the morning," she replied hesitantly.

"Why… do you clean?"

"Uhh…"

"Let me rephrase my question…" After a brief pause, Leon asked, "Why did you become a nun?"

"Well…"