"They say Lord Harald sold 'is late mother's necklace to fund the restoration. I wish I could get it back to 'im somehow..."
Hello Again, Harald is a side story in Octopath Traveler. It is activated by speaking to Reggie in Riverford after Chapter 4 of Olberic's story has been completed.
Locate the Guard standing in front of a house just left of the tavern in Wellspring and use the Challenge or Provoke Path Action to defeat him.
Inside the house, use the Purchase or Steal Path Action on the merchant in the center to obtain the Memorial Necklace. Return the necklace to Reggie to complete the side story.
Harald felt as if a burden had been lifted off his shoulders with Reggie's words. He swore that he would no longer do things alone and they would fix the town together.