Unsure if it's unofficial. The BT21 CHIMMY Little Friends Dog Plush Clip On Keychain Mini K-Pop Bag Charm is a cute and adorable accessory featuring the character Chimmy from the popular K-Pop boy group BTS. It is a must-have for BTS fans and collectors, as it is a retired item and washable for easy maintenance. Perfect for all occasions, this keychain charm adds a touch of fun and personality to any bag or set of keys. Made in China as part of the BTS Line Friends collection, this Chimmy plush is sure to bring joy to fans of the K-Pop sensation.