Joke Collection Website - Talk about mood - Please tell me what part of speech it is?

Please tell me what part of speech it is?

The answer is: happily said

It is a verb, and the verb is preceded by: 地

Extended information:

For "of, Usage rules of "地, 德":

1. "的" is followed by words or phrases that represent the names of things.

2. "地" is followed by words that represent the names of things. Action words or words

3. "De" is mostly preceded by words or words that express actions, and a few are adjectives; what follows are words or words that describe the state of things, indicating how or how they are.