6 aliens. 4 fairies. 2 cupids have landed on Earth for various reasons.

1.    To Conquer Earth [To claim Earth as a possession of the Mato Planet’s]
2.    To Purify Earth [To clean Earth and make it a pleasant place]
3.    To Love Earth [To fix their mistake and make love a lovable place]
 

Aliens. The 6 aliens have a team name, called B.A.P, and made up of Bang Yongguk, Kim Himchan, Jung Daehyun, Yoo Youngjae, Moon Jongup and Choi Junhong, probably more known as Zelo. They have no real personality or any individual, specific purpose. They are wacky, quirky, crazy, strong, manly fierce and everything that you can think of. They might seem as the perfect boyfriend but they are not human, neither do they know how to feel. All they have in their heads are conquering, fighting, winning. They claimed that they are Warriors with Power but are they just that? The flame of conquering Earth satisfies them, that was all they needed, to show that Mato Planet is not to be messed with, especially when the boss of it, is them.

Fairies. The four fairies who formed Secret, they are Jun Hyosung, Jung Hana, known as Zinger, Song Jieun and Han Sunhwa. Unlike the aliens, they each have a specific duty to do on Earth. They are here to purify Earth, cleanse it up to the best of their abilities. They are in training to rise to a higher level in Fairy Land, and that their mission is to live in Earth and do what they ought to do.

Hyosung- Air Fairy.
Air fairies are the ones who make pictures in the clouds. They almost all have wings, and their duties are everything that pertains to the sky. Every morning and every night they paint the sky to give us sunrises and sunsets, they huff and puff to create winds which cool things off and scatter seeds.  They also direct flying birds the right way. Air fairies live in cloud castles and cottages.
Jung Hana( Zinger)- Earth Fairy.
Earth fairies take care of the things that we normally call "nature."  These fairies are responsible for helping flowers to bloom, knocking the leaves off of trees in the winter, helping animals find enough to eat, keep warm, etc., putting nutrients in the dirt, and many other things. Earth fairies usually have an animal best friend and live inside of plants or with their animal friend.
Song Jieun- Water Fairy.
The fairies of water are in charge of making it rain, making rivers flow, and keeping waves in the ocean. Like the earth fairies, they often have an animal best friend. Most water fairies live in seashells or bubbles. There are many water fairies because the Earth is nearly 70% water; that's a lot of work to do!
Han Sunhwa- Fire Fairy
There aren't as many fire fairies as there are some other kinds, but there jobs are just as important! Fire fairies keep things burning, when you see something that is on fire you can bet that fairies are at work. The dancing of the fire fairies is what makes flames. They also are the cause of lightening as it races towards the earth.
 

Cupids. The two cupids working at Love Heaven, Son Yeonhye and  Yang Yeonseul, better known as 2Yeon in the industry they are working in. What are their duties? Basically, to make people fall in love, as simple as that, by shooting an arrow. Firstly, they have to calculate the chances of them getting together, the consequences and the pros and cons, it is not as easy as shooting an arrow, their duty is to make sure that every couple lasts forever or else there will be real bad consequences. It is not easy being a cupid as everyone think it is, they have to have a high number of powers but these two are only strong at two, fire and air. However, what they did not know is that, under their fire and air element, is a mixture of other powers. They themselves are a mixture and they themselves do not know they have other powers. They just think that they only have two when in fact, they have many.
 

• Son Yeonhye, the physical cupid, who reads people expressions and body language. Able to infer from their movements, tends to physically do things like a fire burning a place alive. She manipulates people’s actions once Yeonseul is done fooling around with their mentality. Does not stop for anyone, due to Yeonseul being an air element cupid, she could burn forever, rash and unstoppable.
   
• Yang Yeonseul, the mental cupid, who reads beyond people’s expression, her abilities allow her to empathize with whomever she’s around by simply looking in their eyes. She’s able to feel the other person’s emotions, playing & manipulating their thoughts from hate to love in an instant, which thus make things easier for Yeonhye to manipulate and play around to. She floats around peacefully.

 
What if the cupids were given a quota of pairing up 2 couples by a certain time? What if they paired up non-humans together instead? What if the rules prohibits? What if…it’s the cupid arrow gone wrong again?