Late night in Yu Yan's recovery chamber after the tea audience. Lin Wei weighs the warning note and Min's blackmail note under candlelight.

Lin Wei triggers the Face-Cultivation Ledger and searches Yu Yan's borrowed memory archive for the source of the hidden warning.

Lin Wei leaves the recovery chamber under the excuse of insomnia and uses the princess's status to pass palace servants.

The old moon library is silent, dusty, and forbidden enough to feel honest.

Lin Wei opens the hidden passage using Yu Yan's memory and her own thief instincts.

The passage descends beneath the library into colder, more secret architecture.

Lin Wei discovers the secret medical chamber and sees the real Crown Princess alive.

Lin Wei and Yu Yan confront the horror of sharing one face.

Yu Yan dismisses the physicians, establishing that even poisoned, she rules the room.

Yu Yan sends Physician Han away as well, leaving Lin Wei without a witness or shield.

Lin Wei steps closer and sees her borrowed face reflected beside Yu Yan's real one.

Yu Yan identifies Lin Wei's voice as the weak point and forces her to speak plainly.

Yu Yan overturns the official story Lin Wei was given about the poisoning.

Yu Yan names the Empress Dowager as the poisoner, and Lin Wei refuses to accept it easily.

Yu Yan explains the face-graft was intended to create a controllable permanent replacement.

After Yu Yan explains the rule, the ledger confirms the horrifying consequence in plain terms.

Yu Yan explains what happens to Lin Wei's original face if the tether collapses.

Lin Wei demands to know why Yu Yan agreed to a ritual that endangered both of them.

Yu Yan lays out why Lin Wei, specifically, can do what the princess cannot.

Yu Yan reveals her condition is worsening and the time limit is shorter than Lin Wei believed.

Yu Yan makes the brutal bargain explicit: kill the Empress Dowager or be trapped.

Lin Wei tries to regain power with a threat, but Yu Yan exposes how little leverage she has.

Lin Wei's fear collides with memory-imprint information and a memory of Lin Bao's freedom.

Lin Wei does not forgive Yu Yan, but she begins to think like a thief planning murder inside a palace.