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countryside or city
-Usually, titles use capital letters – Countryside or City.

I was born and raised in the countryside .
-Lose the gap between the last word and the full-stop.

There are so many paddy fields.
-ok

I like it because we can see beautiful natures and the air is so flesh,
-"natures" just needs to be "nature" (no "s" on the end) when you are talking about the environment.
-"flesh" should be "fresh"

but the most thing I like it is that I can live with my family and I know most people around me so I prefer to live in the countryside.
-"but the thing I like the most ..."
-Some sort of punctuation is preferable after "around me" and before "so". Try to figure it out.

I would like to explain why I like to live in the city from the two viewpoints.
-"the two viewpoints" – You could say: "the following two viewpoints" or just "from two viewpoints".

First ,I think people in the city are colder attitude than people in the countryside.
-Lose the gap between "First" and the comma.
-"are colder" – probably better saying "have a colder"

I think people in the city aren't really interested in the other person than countryside's people .
-Lose the gap before the full-stop.
-"in other person" – could simply just say "in others"
- "than countryside's people" – consider instead "compared with countryside people".

but I know how they feel because I had been living in the city 2 years ago.
-Might be ok but consider also, " ... I lived in the city ..."

when I saw a person who crouched down in a station ,
You need to capitalise the "w" because you are beginning a new sentence.
-Lose the gap before the comma.

I wasn't able to talk to him since I was scared of talking to stranger and other people didn't do anything as well as me so I thought it might be a natural thing here. after while , station staff come to and took him somewhere.
-This all needs looking at again. Try to break up into smaller chunks. Start a new sentence with a capital letter. There should be no gaps between a word and any full-stop or comma that follows. The past tense of the verb "come" is needed here – try to find this out for yourself.

Second, it's too hot during summer in the city.
-ok

There are so many buildings, so the breeze doesn't flow well and the air gets really stuffy.
-ok

It's really hot.
-Possibly not necessary to repeat this idea, unless you are doing so in order to emphasise the heat. It's a style issue, really.

I wasn't able to walk outside without UV umbrella.
- The "indefinite article" = "an" or "a" is needed somewhere in this sentence. Can you spot where it is needed?

Therefore I prefer o live in the city.
-Need to correct the spelling mistake here.

but in my experience , it doesn't really matter where you live.
-Something is wrong with the way you have typed the word "but". Can you spot what is wrong?
-What is wrong with your use of the comma? (hint: already mentioned above)

I think it's important that who live with you. ( what is important is not where you live ,but who you live with.) if you live with people who like or love you, even if you are struggle to live in new place, they would support to you .
-Let me suggest an alternative way to write this: "I think that it is who you live with that is important, not where you live. If you live with people who like or love you, even if you are struggling to live in a new place, you can rely on those people to support you.
____
Please come back to me for further help, if you wish.
Sincerely,
mjm