Where can I buy the pure heart of the original God?

Tools/materials: iphone 13, iOS 15.4, Protogod 2.6.

1. First, send it to the upper part of Liyue Port, and then follow the route shown below.

2. Later, I will come to Bubu Road Store and talk with NPC A Gui in front.

Finally, you will open an exchange shop to buy pure heart.