I wrote nothing for eighth and nineth days.

Small spelling error

I was doing nothing spescial, I just practiced listening and speaking.

Another spelling error here, but this word can be tricky. I had to engrave it into my mind when I was little to remember how to spell it. Also, a comma is needed after the word “special”

On 27 June is came out aThe third seasomn of the show Squid Game and I ancame out on June 27th, and I’m going to watch it all in this week.

1. The first part of this sentence is structured incorrectly, I adjusted it like so. This can be a bit more of a complex topic, so I’ll just leave it at that. I do recommend that you study English sentence structure though
2. In English, dates are usually referred to as “June 27th”. You way works just fine, they’re just written the other way more commonly
3. The word “in” is not needed in the last bit. Just saying “this week” works just fine

I have a huge expectations for this movieseason.

You’re talking about a show here, not a movie. And since you’re talking about the season, you should say “season” :)

The director said that end of this movie is going to bethe show will get a sad aending, not a happy one.

What you wrote works fine, but sounds odd so I changed it to this. And also, since you’re talking about the end of the final season and the show as a whole, you can say “show” instead of “season” here. “Season” works just fine too though, the words are interchangeable

I wrote nothing for the eighth and nineth days.

Need articles.

I was doing nodidn't do anything spescial. I just practiced listening and speaking.

I would use "I did" over "I was doing" because you don't need the past continuous. You would use past continuous if you had another event running alongside.

And then, I would change "I did nothing special" to "I didn't do anything special." Both are correct, but the second one sounds more natural, and kind of makes more sense.

On 27 June is came out athe 27th of June, the third seasomn of the Squid Game came out and I anm going to watch it all within this week.

came out is your verb, not is. Remember that it's subject and then verb. Your subject is "third season of squid game," verb is came out.

"in" is technically correct, but "within" is better for what you're trying to say.

I have a huge expectations for this movieshow.

Expectations is plural, so you don't need a, which is only for singluar.
And I believe squid game is a show, not a movie.

The director said that the end of this movieshow is going to be sad and not happy

end is a thing that needs an article too.

I wrote nothing for the eighth and nineth days.

I was doing nothing spescial, I just practiced listening and speaking.

On 27 June is came out a27th, the third seasomn of the Squid Game came out, and I anm going to watch it all in this week.

Since "Squid Game" is the title, there is no need to add "the" here

I have a huge expectations for this movieseason.

It's a TV series, not a movie, and here you are speaking about the third season.

The director said that the end of this movie is going to be sad and not happy.

"And not happy" feels very redundant after "sad," I would leave it off