I was so sad when I ended the series because I feel like I didn't get enough closure when Fu Yu finally remembered their past. To me it ends too abruptly like we didn't see the aftermath of him remembering. But then after some digging I found some vids on douyin (Chinese TikTok) where there's one last part that I didn't find on YouTube. It started with Fu Yu saying haven't seen you for a long time. Bai Qi looks up with teary eyes. Fu Yu then asked how long? To which Bai Qi replied a thousand years / a millennium, but it's only a moment (when waiting for you ). Fu Yu then crying and said I remembered it all. To which they both laugh and cried happy tears.
Sorry if my retelling is kind of off I direct translated everything. Chinese and English is not my first language but I tried because I feel like every fan of this series should know this important last part. To me this last part really ties it all together nicely.