Good morning. What do you mean by my long return?

this sentence means good morning, my longhui.

"Good morning, my long return" is a warm and loving greeting. "Good morning" is a morning greeting, expressing concern and blessing; "My Longhui" is a kind name for a place, which means that this place has special meaning or emotional connection for the speaker.

The whole sentence expresses the speaker's concern and love for the other party, and also conveys a positive and warm emotional atmosphere.