The letter in my heart has been successfully sent. Can I delete it?

The heart letter has been sent successfully and cannot be deleted.

Letters from the heart are sent in one second.

It usually takes a second to receive it. Under normal circumstances, short messages can be received in about one second. Of course, this is based on the fact that both mobile phones are turned on, or the network is unobstructed, and the sending speed of short messages is very fast, and it is usually targeted, because the information transmission speed is very fast.