If you are travelling to any of these three destinations forget about the positive ideas around tips, since due to their culture they can end up being an inconvenient you want to avoid.
While in areas more used to western culture, such as Hong Kong and Macao, tips are usually thought of as a matter of etiquette, in the rest of China it is so uncommon that they might even end up following you to give you your money back. In the Asian Giant leaving tips is something unusual and in some ways even offensive, since it can be interpreted as a way of undervaluing the work of the waiter.
The impeccable service you can receive at a Japanese restaurant comes included with the costs you paid and in the conviction of the importance of their job, so giving thanks before leaving the restaurant is enough while if you insist in giving a tip you might offend the waiter to the point of feeling insulted.
You have to check well before your gesture of generosity or thanks, because whether you believe it or not, tips have been banned here by law. Slowly some restaurants have adopted the policy that allows it but without a doubt it is best to avoid it.