The map below shows where the milkman in your area got his red hair DNA:
Red hair DNA in Europe:
https://cache.eupedia.com/images/content/red_hair_map_europe.jpg
Some time back, I watched a Taiwan TV series call the Office Girls. There were several characters that exhibited what must be considered as auburn colored hair. That is, rather than black the hair was reddish brown especially when back lighted.
The hair color wasn’t red but it was close
The Office Girls is on NetFlix and is excellent TV
The show is in my view an allegory concerning the young people of China existing under the rule of the communist party. Youth prevails
