You must have a heart of gold.

 

What's a Smartan?

Good writing.

Below are just my two cents:

She thanked for my help and hanged up on me abruptly, the click sound cut off my most sincerely wishes to her.
She thanked for my help  ==> She thanked me for my help
It's a run-on stenece.
head set ==> headset

A regret, to be more precise, deeply imbeds in my mind for years that re-surfaces vividly every time that something is life and death related. ==>
A regret, to be more precise, that deeply has imbeded in my mind for years re-surfaces vividly every time that something is life and death related.

There was a later afternoon, warm and humid, heavy clouds overcastted the sky and made the city grey and depressed. ==> In a later afternoon, warm and humid, heavy clouds overcastted the sky and made the city grey and depressed.

all kind of walks ==> all walks of life or any walk of life

catched ==> caught
same time with me ==> ???
A guy at his later 50’s was getting off at a bus station when I caught a local bus to my suburban neighborhood.
he pushed his right shoulder against the door frame...  ==> he leaned his right shoulder on the door frame ...
He sank himself onto the bench leaning on the glass wall, where provided him the best support ever.
==> "where provided him the best support ever. " has no subject?

 

But everything happened so quickly within a few seconds, when I was still trying to figure out what was going on with him, my bus was coming. ==> But everything happened so quickly within a few seconds. While I was still trying to figure out what was going on with him, my bus arrived.
 I took it as a granted permission, and reassured myself nothing was serious, you could go now. ==>  I took it as a granted permission, and reassured myself that nothing was serious, and that you could go now.

 

Now, I know, he was experiencing heart attack, the well-known silent killer in the world. How I wish I could have been knowledgeable enough to recognize the symptoms of heart attack. How I wish I could’ve called 911 regardless.

he was experiencing heart attack ==> he was experiencing a heart attack