First scene was filmed after production had wrapped?

I just noticed how different Perth's hair is during the very first scene -- longer as well as dyed a similar color to Mean's (aka Tim). Later on when he's at home for his birthday his hair is back to the usual length, style and color.I'm going to guess that the scene was filmed later, possibly after production had already wrapped, when Samsung had paid for the product placement.

About Tin & Can

They are so cute and romantic couple. First they were enemies .Then Tin started to like Can .In the end, they both loved each other.