Hi Huyen,

Here is my take on this as a college level American born English speaker.  I will add explainations after I show how I would write what you've written.  Your English writing is excellent.  Much of what I did is drop the implied text.  BTW I've seen WGM.

I’ve just watched a Korean reality tv show, called We Got Married. On one of episodes, the main couple, is required to welcome a foreigner. Unfortunately, the couple can only speak a little English, so the whole conversation is usually yes or no questions.  I can feel the moment when both the couple and the guest want to communicate with each other but their ability is limited.

 I imaged I was a interpreter and helped them speak together.  To Fancy, (an Afghanistan man),

     "Hi, Fancy,  I’m Huyen. I’m here to help you make sense with what is happening.  I will tell you about the show and the couple you are meeting.   As you know, This is a reality tv show about newlyweds. The catch is that all couples haven’t dated yet in real life or even met each other before. When they participate in this show, they become a couple and will have time to date before getting married in the show.  The "dating/ marriage" usually lasts 4 or 5 months depending on the writers and the couple's relationship.  The couple doesn't marry legally in their real lives and will separate at the end of the season.  The premise of the show is that two celebrities play house.  Today, You are the Adam couple’s guest. They are 3 months newlywed, and their job is to help you to become familiar with the Seoul lifestyle."

i hope the explainations make sense. Everything is run together because of character limitations. Questions ? Let me know. Hope it helps.

please check this paragraph both in grammar and word choice ^_^

Topic: I’ve just watched a Korean reality TV show called 'We got married'. In one of episodes, the star couple is required to welcome a foreigner. Unfortunately, they (the couple) can speak little English so that much of the conversation is closed questions with only a 'yes' or 'no' reply. I can feel the moment when both of them want to talk to each other too much but their ability is limited.

At that time, I imagined I was an interpreter there and transformed the situation with:

Hi Fancy- an Afghan man , I’m Huyen. I’m here to help you guys make sense of what is happening

First, I would like to show you some information relating to this TV show and the couple, too. As far as you know, this is a reality show telling the story of 2 newly-weds. Technically, the couples haven’t dated yet in real life or even met each other before. When they participate in this show, or become a couple literally, they will have time to date before getting married. The dating period often lasts 4 or 5 months depending on the writers and their relationship.

Today, You are (a Adam couple’s?) guest. (They=?) are 3 months newly wedded (or newly wed), and their job is to famliarise you with Seoul’s life-style.

Very well written!

please check this paragraph both in grammar and word choice ^_^

I sense how they are trying to talk to each other but their ability is limited.

So I imagined I was a interpreter and was able to help them with their language problem.  

Hi Fancy- a Afghanistan man , I’m Huyen. I’m here to help you sort your problems out. 

First, I would like to show you some information related to this TV show and the couple too. As far as I know, this is a reality show on newlyweds. Technically, all couples haven’t dated ever in real life or even met each other before. When they become partipants of the show, they will have time to date before getting married. The dating period often lasts 4 or 5 months depending on the writers and their relationship.

Today, You are a Adam couple’s guest. They've been married for three months, and their job is to help you to be familiar with Seoul’s life style.