Dan Heng was cleaning and reporting a new relic/artifact they found as he entered all the information he knew about it in the archives. The next day he was walking around on the Astral Express. He eventually noticed that the relic which was a yang necklace started to glow and pull him forward, like it was leading him somewhere on the train. He eventually bumped into someone who had a yin necklace made with similar materials as the relic yang necklace he had in his hand.