On their site you can see that it has Chinese letters and as some said they are from china, but:
Registrant Organization: Allcoin Technology Limited
Registrant State/Province: British Columbia
Registrant Country: CA
http://whois.domaintools.com/allcoin.com
Is canada, this shows that they are very suspicious
“The company has its headquarters in Canada and is listed on Canadian Securities Exchange (CSE) with the stock code as CK. This cryptocurrency exchange is registered and supervised by FINTRAC (Financial Transaction and Report Analysis Center of Canada) for legal and all formal operations regarding exchanges.”
[1] https://coinpedia.org/exchange/allcoin/