It was getting late, everyone on the Astral Express was slowly going to their rooms and go to sleep. But Dan Heng was not going to sleep, he was busy making researches for their next destination. He wasn't someone who needs much sleep anyway.

Suddenly, the man heard a knock at his door. He didn't have the time to say something that Caelus was in the room. He didn't mind since they were together, the other was the only one allowed to do that.

“Oh it’s you, Caelus. You’re not going to sleep ?” He then said with his usual calm and collected voice.