Dear Yuto Aihara,
* This is the happiest time for me.
* What is your favorite time of the day? ( when you say "favorite", "most" needs to be dropped)
- The first two sentences are written in an extremely informal manner. Instead of saying,
"Hey guys!! How are you doing??"
You might simply say,
"Hello. How are you?"
Your written version is more of a slang!
Aida N.