The Red tint issue in the Galaxy S8 seems to be much more widespread than previously thought. The cause of the red tint is due to Samsung's rush to get the phone to market without taking time to properly configure some of the displays. The phones in question have a red tint stemming from a white color imbalance. The issue is very noticeable if you put the phone next to an S8 without the issue. Samsung is currently sending out an update to "fix" this issue in Korea only. Samsung has also stated that if the update does not fix your device you can just trade it for a new one. I personally would just replace your device.
via SamMobile