Doppelgangers.
Lan JiRen and the other guards were quite tired. Li Jun had been waiting outside the doors of the Library for a long time after Tai Yang and Xiao Xia had gone in. Seeing how pale he was, Lan JiRen suggested that he watched over the duo instead.
That was several hours ago, and it was nearly midnight.
One guard yawned. "Hey, don't yawn! You'll make the rest of us-"Another guard started but ended with a massive yawn himself."
Soon everyone was yawning. Lan JiRen bit his tongue to prevent himself from doing the same.
'I have to watch over then very carefully. I can't be falling asleep like this. His majesty didn't look well at all, and he's only allowing me to do this because he trusts me as the 4th strongest Offense type in Changying, so I can't be yawning! Ugh! Get it together!' Lan JiRen thought. He'd been up patrolling the last few nights, so he was exhausted. Nevertheless, being as strong-willed as he was, he kept going.