My interest piqued with this drama when I saw a trailer was recommended on my YouTube.
It got my attention with what I saw in the video.... parkour action, and some cute romantic scenes. And thus my journey began the following day after I breezed through the previous drama I was watching.

STORY:
The plot is very interesting, hence why it caught my attention in the first place. Some hot shot millionaire guy trained 4 boys from childhood to adulthood in order to use their data to create a game catered towards women. The concept is cool, but the repercussions were beyond insanity if you really think about it. His target were women who were lonely or women who were already in a relationship that craved love or attention that they were not getting from their significant other. He made the guys so perfect that it was so unreal, but the women didn't care. The more they didn't care because they were receiving something they not got in real life, the more immersed they were in the game to the point where it became unhealthy. This man was trying to take over the world with his deranged self. This in itself was wild, yet fascinating because I could not stop watching. It gave me a feel that I was watching something similar to Spy Kids crossing over with Inception. It was wild because half of the time I couldn't tell if they were in a game or in reality. It kind of messed with my head. LOL

ACTORS/CHARACTERS:
There were a lot of characters and to explicitly explain my likes and dislikes of each character, I'd be writing a whole dissertation and no-one has time for that. I'll just give my thoughts in general about them.
The four boys who who were locked away from society from childhood to adulthood they were only around each other and around the boss and his assistant. They were still like children even though they grew up in regards to the fact that they did not know how to interact and adjust to the outside world.
The main leading girls who were also best friends were okay. They were wild and a force to be reckoned with. They helped the boys a lot because they were the first people from the outside world they interacted with.
The grandma, I couldn't understand her though she was cool and badass!
The main antagonist, he was so twisted. He kept saying everyone betrayed him, but he was out of control. He was like a brat who threw a tantrum when he didn't get what he wanted and would try to harm others who got in his way that didn't agree with the way he thought. The actors did the best they could. The acting wasn't all that great but it wasn't bad either.

MUSIC:
The music was ok. Nothing catchy or made me want to sing along. However, the fours guys did sing the ending song I believe. It was cute.

Would I rewatch this drama again? Probably not. It was a one-watch-wonder for me. Why? Because watching again would not be a surprise since I know all the tricks and mind-blowing plot twists. There were a lot of plot holes, but I ignored majority of them in order to enjoy the drama. The build-up was there and intense, but then I don't know what happened. Still, there were some questions I have that are still unanswered, and I guess I'll never get my answers and will have to leave it up to my imagination. Would I recommend? It depends. If someone is looking for a something interesting and out of the ordinary then yes. It was refreshing to watch because I've never seen a plot like this before, minus the romance, which was cute. However, I think it could have been better. That ending messed me up tho. LOL
Overall, it's not a bad watch and its something one could watch to pass the time if they don't know what to watch! ^.^