C-O-I-N-C-I-D-E-N-C-E (Part One)

Can you please explain to me the meaning of 'Coincidence'?
As I don't think you can understand the real meaning..

Oh?you're not?
Try this.

Sunday night, few of us had a gathered dinner.
Participants are including Bon, Sam, Hui, GuoChuan, and me.
But, things are not like expected and comes a new friend, Chean.
Dinner just like planned and started around 8pm.
We got arranged to the third floor.
We went up through the lift.
We passed by so many customers and I am the last out from the lift.
I observed a female customer's back and think she has a familiar view of Hui's back.
I mentioned to GuoChuan privately.
He ran in front of the girl and check it out.
the girl say 'Hi'.
Yes, She is Hui.

Hold on.

Hui is originally with us?
or she is as one of the customer before us?
I seriously couldn't figure it out as I have been informed about the absent of Hui for this gathering.
In fact, Hui refused us for this gathering due to the dinner she is going to make with her family.
But we met at the same restaurant.
Same dining time, same floor, and out of not less than 100 customers.
Of course, we never tell our destination of the gathering in advance.

Importantly, it's so unbelievable as it begin with an one sight and it just has the familiar view of Hui's back!

I just think this is extraordinary and totally incredible :)

Proof No.1

Proof No.2

--End of Part 1--