I usually get enough sleep and drink plenty of water.
(https://i.ibb.co/fVb00G05/mao1lwxmh98h1.jpg)
Get enough sleep and stay hydrated, but you can't erase dark circles completely in such a short time. You'll need to use orange-tone corrector and concealer.
No, I don't think that's a real person in the picture; it looks too staged. Maybe it's just a reference? Anyway, the simplest advice is to stay well-hydrated and get good sleep; you can also cover the circles with makeup.
Why are you posting AI-generated pictures?
Drink plenty of water
Use eye creams
Get enough sleep
Check your iron levels and any gut or liver issues. Dehydration or lack of sleep rarely cause dark circles like the ones in the picture.
Please see a dermatologist. It's better than asking strangers online, especially with your wedding just a month away.
A professional treatment is your best bet, or you can simply use makeup.
No under-eye cream will work in just a month. It's better to eat healthy and apply aloe vera gel mixed with a vitamin E capsule if you aren't acne-prone. Also use a good amount of moisturizer and sunscreen; consistency will help somewhat. I still suggest visiting a dermatologist and checking for any vitamin deficiency to speed up recovery. Hope it helps ✌
Check your haemoglobin level.