C739 Cost too low

When I arrived at the staircase of the second floor, I wasn't in a hurry to go down. Instead, I first cast my gaze down the stairs, and when I saw the scene below, I couldn't help but be taken aback. This is because, given the current situation, I still don't know the exact situation below.

When I looked down the stairs again, I could roughly see what was going on downstairs.

As I thought