How to reply when the boss sends a red envelope on my birthday?

First of all, I would like to thank the leaders and then say that I will continue to work hard.

1. First of all, you should express your gratitude to the leader. You can say "Thank you, leader. Thank you, leader, for remembering your birthday and sending a birthday red envelope."

2. Then you can say thank you to the leader. I will definitely continue to work hard to contribute to the company in my future work and life due to my constant cultivation and guidance.