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I can guess that even before Melissa was infected, this place had already been set up secretly. It's just that after Melissa died and was isolated, the George family merely sealed the doors and windows and blocked it with an external wall.
They didn't discover this ventilation duct, likely because the boiler room had also taken covert measures to prevent this potential problem from being exposed.
Before crawling into the vent, Yan Junze stuffed the two newly-born brats inside first, then followed himself.
As he crawled in, he turned his head to look at the cloth sofa that blocked the entrance.
The house was quite dark, and the space behind the cloth sofa was impossible to see without getting close.
Once inside, Yan Junze reinserted the large heating pipe back into the vent.
Because there was no time to spare, he was too hurried to look around Melissa's room after entering and quickly sealed the entrance.
