How do people know who's who in K-Pop MVs?

Quote from bethesda

People know who's who in TWICE by using the TWICE song (here it is in case you haven't heard it):

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But how do you know who's who in groups with individuals with similar hairstyles such as BTS?

What about individuals in K-Pop songs with an unusual hairstyle? KpopVeteranARMY correctly identified the news reporter with "crazy hair" as Gongchan in the song Beautiful Target by B1A4

Here's the song with the timestamp just in case.

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How do you even tell if they all look the same? Lovelyz looks like they're all sisters!

What about telling who's who in NCT

(They have six sub-units. Twenty-six members are in NCT in total, and that includes its sub-units)

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for most groups I stan, I try to remember the order when they sing their lines (or at least when they sing their first line) so when I watch music show performances I recognize "hey that's the member who sang the first post chorus". that usually works for groups under 7 members. thats exactly how I stanned candy shop/red velvet/kiss of life/weeekly/youngposse

either that or I religiously watch a specific video by them until I force myself to recognize each member. (the amount of times I watched that dingo mafia video of LOONA is outrageous....some members had different hair colors thankfully)

for me it's variety shows with the members interacting with each other.

it's easier to remember instances where so and so member had some kind of memorable interaction with each other and me remembering that interaction and then recalling who the member was at that time.

I find that as the fastest way to remember member names that way.

omg racist.

I honestly struggle with both remembering names and if I do remember the names struggles to put the right name on the right faces, even in groups that are favorite groups. In some groups I recognize the different individuals, but can't remember the names, and some times I know names, but can't match them to the visuals.

The only super easy group for me was 2NE1, and well BP is pretty easy. T-ara I struggled to tell who is who even if they were my top favorites, you always get some members that are easy to pick out, like Boram in T-ara, but others take a bit of learning. Crayon Pop had twins so.........

And I have groups I know the names of the members, Aespa, but I can only put the right name on the right person on one of them (NingNing), the rest are just looking too much alike for me, but I have put that much of energy into learning them.

A group like Girls' Genartion I did know the membembers that well during the their peak, same there, you got some easy ones like Sunny and Yoonah, but hard time with the others. Today I know them a little better. Twice a bit similiar even if I feel they are a bit more easy.

But I really put much effort in learning who is who, if it's not a group that are a top favorite. I just learn by read articles on internet/forums, and maybe clips on youtube and learn that way. I guess people watching variety shows learn the indivudals in groups at a different level.