Quick answer: Open Zhou Ping’s cage and talk to him before picking up the Tiger-Head Switch. Then get his last letter near the Shrine Outer Gate bell and give it to Yu Ling for the Ultimate Talisman.
Don’t Forget Me is a short side quest in Phantom Blade Zero. It links a woman waiting in Pangzhen with a scholar held captive in the Mountain of Imprisonment, and it can be lost for good if you get the order wrong.
Where Don’t Forget Me starts
Yu Ling is on the upper floor of the inn in Pangzhen. The inn is about 33 m from the Marketplace bell, and she stands about 5 m above that bell. Talking to her starts Don’t Forget Me. Zhou Ping, the scholar she is waiting for, is held far away in the Mountain of Imprisonment.
A ladder inside the inn takes you from the ground floor up to Yu Ling. Enemies are waiting on both floors, so clear them out before you try to talk to her.
You can also start the quest from the other end. Talking to Zhou Ping in his cage adds Don’t Forget Me too, so it does not matter which of the two you meet first.
Don’t Forget Me is missable
Do not collect the Tiger-Head Switch item until after your first conversation with Zhou Ping in the cage. Otherwise, he will already be dead when you find him, and you will see only his death scene.
With Zhou Ping dead, there is no letter to collect, making the quest impossible to complete and the Ultimate Talisman unavailable on that save. Speak with him first, and postpone collecting the Tiger-Head Switch.
Find Zhou Ping in the Mountain of Imprisonment
Zhou Ping is in a cage in the Mountain of Imprisonment, about 106 m from the Commander’s Platform bell.
Release him from the cage, then start a conversation while standing immediately beside it. This conversation must happen before you collect the Tiger-Head Switch.
Get Zhou Ping’s last letter
After completing that initial conversation in the cage, find Zhou Ping again, roughly 46 m from the Shrine Outer Gate bell.
Talk to him there and he gives you his last letter. You know it worked when the objective changes to “Deliver Zhou Ping’s last letter to a woman named Yuling in Pangzhen”.
Deliver the letter to Yu Ling
Return to Pangzhen and use the Marketplace bell; then climb to Yu Ling on the inn’s upper floor.
Speak to her while the letter is in your possession; she accepts it and rewards you with the Ultimate Talisman, completing Don’t Forget Me. Without the letter, her dialogue only repeats the quest’s opening.
The Ultimate Talisman reward
The Ultimate Talisman is an Offensive accessory. Its card reads “Power Surge inflicts 20% increased damage on enemies with Guard Broken.”
Polishing it once at Jewel raises that bonus to 30%. The upgrade costs 35,200 Remnant Dust plus a Tainted Crystal Shard.
