Mu You originally thought that such a lake, located within a depression, would not connect with the rivers outside.
However, upon scrutinizing the map more closely, he discovered what was actually a small branch of an underground river, connected to the lake through a winding, unseen channel.
Therefore, there were two paths to reach the place where the frog was kept captive: one, directly attack from the land and two, infiltrate from the underground channel.
The former was out of the question. The lake was too close to the Imperial Capital, heavily fortified. Launching an attack was akin to giving oneself up, not to mention stirring up unwanted attention.
Mu You initially planned to wait until the guard tower fell and the guards surrounding the lake retreated before seizing the chance to rescue the frog. But with this underground passage in sight, rescuing the frog ahead of schedule became a possibility.
