In my headcanon it's not one specific moment, but more like Zhao Yunlan suddenly realizes what the 'what did you just call me?' thing was about, and just starts calling YOHE Shen Wei 'Xiao-Wei' on the regular. But that's not exactly visual/filmable, so yeah, I would also absolutely love to see it adapted with one specific moment. ♡♡♡ No idea what it would/should be, but I'm sure the drama writers would know. :D