Nyarlathotep, the god of credit, wields the authority of trust; trust is a currency that can exchange anything, yet it also has a potential for destruction.
Yaoqin had once warned Li Mumu that the slightest crack in her trust for Wendy could lead to extremely terrible consequences.
Defaulting on a loan could lead to being blacklisted (but that's not the point).
At the time, Li Mumu didn't care. On one hand, Wendy had grown up with her from childhood as a close friend, and a teammate bestowed by fate. If Wendy couldn't be trusted, then no one else could be more trustworthy.
From another perspective, trust is mutual.
Facing Wendy's doubt, she immediately counterattacked, "Are you doubting that I'm doubting you?"
This rendered Wendy speechless.
"I have amnesia; why couldn't you have amnesia too?"
