I have a brother who is very busy recently. I send him messages every day. I'm afraid he will be angry. I want to call him for fear of disturbing him. I don't know what to do.

If you have a good relationship, it is a concern, but now he may feel numb and tired because he gets too much attention from you, so he will hate you. For example, if you eat a food for a long time, even if it is delicious, you will be bored. Similarly, you should share your worries for your friend and let him feel that you care about him, not bored. You can learn more about his recent life, talk to him about practical life problems and help him solve his troubles.