Yes, the act of casually using a well-known trademark without the consent of the other party is trademark infringement, because the infringement of the exclusive rights to registered trademarks stipulated in the Trademark Law of the People's Republic of China includes: Any use of the trademark without the registrant's permission may lead to criminal liability for infringement of a well-known trademark.

"Trademark Law of the People's Republic of China"

Article 57

Anyone who commits any of the following acts shall be deemed to have infringed upon a registered trademark. Rights: (1) Using a trademark that is identical or similar to the registered trademark on the same or similar goods without the permission of the trademark registrant (2) Selling goods that infringe the exclusive right of a registered trademark (3) Counterfeiting or manufacturing without authorization Registering a trademark logo by others or selling counterfeit or unauthorized registered trademark logos (4) Changing the registered trademark without the consent of the trademark registrant and putting the goods with the replaced trademark back into the market (5) Giving exclusive rights to the registered trademark to others causing other damage.