Curate, connect, and discover
When I rewatched the Bridon Arc, I noticed that each time Lu Guang has a nightmare (once in episode 3, and again in episode 4), his watch is stuck on the exact time and date that he chose to abandon his original timeline to try to save Cheng Xiaoshi. More specifically, it's the date and time that he associates with Cheng Xiaoshi’s death: September 13, at 00:05.