The daughter of the late strongman has become the new president of Korea

Her father was a Japanese military officer during the Japanese occupation.
He promised to be faithful to the Japanese king with his blood,
and he fought against to the armies of national independence and caught them.
Unfortunately, after the independence, the pro-Japanese group got the assumed power,
and the top-leader of the national indepence group was killed in blind an ambush.
Her father became a president by the a coup.
And he pressed down suppressed the democracy group.
The new president didn't offer any apology.

But in those days, the Korean economy was grown grew.
Due to this, people of my parents age feel very thankful for him in this perspective.
They think they have to reward it to his daughter.
They are the base of power of her. That is the basis of her power.

I'm sad. Very sad.

Notes: I am not sure what in blind means so I am guessing at an ambush.

I have added late into your title to indicate someone who has passed away.

On the whole, an English speaker would have little or no difficulty in understanding your essay.

The only difficult part would be in blind. If your English speech is at this level, an English speaker

might ask for clarification of this phrase. Otherwise all is good.