Is Centellian24 actually a legitimate brand?

Centellian24 is a legit brand in Korea (it's a brand by Dongkook Pharmaceutical, one of the oldest pharmaceutical company in S.Korea) and they've even collaborated with Picky before, but I'm not entirely sure about this email. Their email address doesn't look suspicious to me since it uses their own company name, but I recommend contacting them on their IG to confirm.

the email format looks real but the email address is sus but maybe it is real

I would not trust it to just be safe. The email is the biggest give away since its not correlated to the actual brand.

I've got the same email too but its from Hanni tho

The only thing that makes me question it is the sentence error: (This collaboration will only planned as gift collaboration) Not only was it incorrect in language, but there was no need for parenthesis, and there's no period. I want to hope it's real for you though! Have you tried googling "is centellian24 legit" or maybe the product or anything about receiving an email from them? That's usually the first thing I do when checking to see if a brand or website (or anything else) is legit. I usually figure it out that way, and it almost always provides and answer from somewhere across the internet lol. If they have a brand website, you can also check the contact information on there. Whatever you do find when you Google them, be sure to inspect it thoroughly and do some digging.