Most Helpful Guy
Since you're Asian I assume you should know about rice water usage has been practiced in Asia for hundreds of years to skin lightening, skin glowinh, etc
There are many prescriptions and formulas included rice water, so google it
Most Helpful Girl
Put a lot of cream, there's special cream made for "after exposition under the sun" and cream made for burn.
I used a cream for burn when a whole pan of hot water fell on my legs it helped a lot (I have no scar). I think it would help with sunburn.
Too I think you shouldn't go under the sun anymore.