It had potential of being a good drama.

Its either limited time or the writer and producer couldnt figure a proper ending in tying the loose ends.
The production to the series seems like there wasnt enough effort in differentiating a bionic person and a real person. what was the reason for hatred between the two. Also is this euphemism between foreigners vs residents intermingling with each other. (maybe cause they make it in a way that real people were the superiors and the bionic people were the inferior...)

We see a bionic person raising a child better than a biological parent. Two bionic people falling in love and and out of love, and one ending the life of their counterpart. The man-hunt of illegal biotic peoples. (this part did not make any sense, as where did that come from???).
Where did these bionic people come from, at first the story makes it sound like they were made in a lab. They are then sold into the market as nannies, lovers, workers, etc.
The next they just happen to be there , and you can alter a bionic person's memory into thinking that they are a real person from the beginning.
Another issue was that, telling the difference between a real person vs. bionic person. As side from a little programing "magic" and their eyes turned white. Otherwise you really cant tell them apart. Really disappointing that they didnt put any effort in that part to make it obvious.
The whole series was just a incomplete and had too many stories with many plot holes and not alot of time to properly answer them.

I was hoping that they were able to answer as to why, where, what cause the rift between the two species. With soo few episodes to this drama. It doesnt make it a proper drama. They just jumble some stories together and left it like that.

Dont get me wrong, the acting between the two leads were fantastic. Them stepping out of their comfort zone, I give them props. I just felt unfortunate that they were given a half-written script and had to act and guess/ab-lib the rest to present this so-called "drama"