(In English any starting statement, even topic headlines the first letter is capitalized. So it's My instead of my. It's ok though, because it's a minor mistake.)

  my favorite movie ; Dark night

I've seen various kinds of movies in past 20 years
I'm not sure what to choose as my best movie. because every movie inspires me to give a direction of life and great meaning.
Well, i'm going to try to inform the best movie ever seen since my 30's(.) (You were missing a period Mark to end your first paragraph.)

Here's my top movie "dark night". I've even done it over 10 times (another missing (.) here).

As you know, it's directed by Chris nolan, a movie starring Chris Bale (Christian Bale always went by his full first name) is well known for block buster movie.

** I would rewrite and rephrase this paragraph like this "As some of you might know this movie was directed by Chris Nolan and starred Christian Bale a well known actor who featured in many block buster movies.

If you see that movie in simple vision, it's just about a battle between goodness and evil.
but Watch every character more carefully. That informs you a harsh truth in our living world.

**Rephrase- If you have seen this movie as another simplified "Good vs. Evil" battle I suggest you watch it again and this time pay special attention to every character's background story. It's really an eye opener to set our sights to the harsh truth of our world and society.

Let me tell you one example.

Bruce wayne is a person who always trys to make a better world.
He had a calm insight, a brilliant brain and even countless money.
In short, he is a perfect guy and symbol of goodness.

On the other hand, Joker isn't a person born with silver spoon like wayne. there had been many troubles in his whole life and those (it) made him "evil" (.) *missing period.

It seems (seem not seems) that they can't be blended like water and oil. But the more you see the film, it's not true. They have a very close relationship. One character can't only exist without the other character. In other words, they became essential parts of themselves.

What I want to say is the fact that goodness is never different from evil. In real world, something brings a harmful and beneficial consequence to the people at the same time.

**Rewrite- So in all conclusion I just wanted to point out the fact that good isn't so different from evil. Because without evil we wouldn't know the meaning of good. Just like light and darkness; Darkness is only an abstention of Light. In other words, they are essential parts of themselves.

Hope my little notes helped. Also, I enjoyed reading your writing and thoughts. Very entertaining and also I agree with your thoughts and statements on the Good vs. Evil topic. We, as the human race are too far gone and stuck on the idea of plain logics that we tend to look pass the more informative details of what's happening around us. Maybe it's because we are too caught up in our own battles. Such a sad world and truth we live in. 

Also if you have any questions or confused on any of my feedbacks and notes please feel free to message me.