The Travel Linguist - Mandarin 101

'You' plural is 'nǐ men'. 'nǐn' is the formal form of 'you'.

I've just started learning mandarin myself, but I don't know why they used 'nǐn' in this video.

"nin", as I know it is "you"-plural

What is the difference between "ni hao" and "nin hao"?