As long as this tunnel exists, slipping in without anyone knowing is absolutely easy; you could even say, without the slightest exaggeration, that even if the two of them swaggered right in, those Guards still wouldn't notice a thing.
Not only that, even if those Guards really did run into this old man, they wouldn't dare believe he actually came back—and came back while they had the place tightly surrounded. That would be enough to make jaws hit the floor, something people simply wouldn't dare believe or even imagine.
Besides, what these people were guarding wasn't whether this old man could come back at all, but whether his family might slip away, or whether there was any chance of inside-outside collusion.
Once he thought of the tunnel, the old man immediately quickened his pace, leading Lin Yi through several twists and turns straight to a very inconspicuous civilian house.
