Why is warm white line on edges of my samsung galaxy s7 edge?

[magicales]

Hi!
On my edges i saw little warm white brightnes coming out betwen screen glass edges and aluminium housing..
It can be best seen if i open white image.
It looks like there is a little space betwen glass edges and aluminium housing? Maybe can water go in?

I bought this phone from other person, and he maybe replace the screen front screen? If the front screen was replaced samsung galaxy s7 edge is no waterproof? :-[

LINK OF WHERE IS SPACE BETWEN GLASS AND ALUMINIUM HOUSING: https://postimg.org/image/4ib8yfj39/