Yu Liang had indeed forgotten about that.
In the instance, aside from Li Huazhao, there was also an Adventurer, whose "adventuring" ability was by no means inferior to that of Li Huazhao.
Just like now.
He ran all the way to the door, opened it, and called out to the Adventurer, "Stop shouting, come in."
The Adventurer glanced back at the staircase, saw nothing chasing him, and then crawled into the laboratory, "Something was chasing me earlier, but now it seems to have stopped, I don't know why."
Yu Liang, hearing this, immediately retracted his two Grass Baby Mechs— he was worried that leaving them at the door might cause them damage.
Leaving the task of keeping watch to the monitors should be okay, plus with those evil-repelling items at the door, there was no need to worry too much about the Ghost Man Upstairs.
The premise was that the Adventurer hadn't provoked the ghostly figures too severely.