Part 1: Beta Project

In the year 2007, two young children walk alone in the woods with a bike between them, moonlight guiding their way through the dark. The younger brother asks his older sibling: "How did you find me? Twin telepathy?" The older brother scoffs at the idea and tells his younger brother not to go wandering off into the mountains anymore.

The younger twin, Cole Parker, keeps telling his older brother, Cameron Parker, that this time, he's sure: He's convinced that aliens and UFOs are real. Cameron asks for evidence, and Cole is happy to oblige: Exhibit number 1 is the fog, but the older brother explains it away by temperature difference. Exhibit number 2 is a burnt pine cone, but this is similarly explained away by the presence of local lumberjacks who also work in the area.

Suddenly, a white light beams from the sky, seeming to chase them menacingly. They get on bike to flee, but it keeps following them. Faster and faster, Cameron pedals as streetlights burst when they pass along the street. A truck almost runs into them because of the bright light, but it misses them by a hair and crashes.

The bike falls when a light from the other direction comes toward them — but it's the headlight of a car that stops in front of them. It's their father, Anthony Parker, who comes out of the vehicle, and he runs to save them from the strange bright light.

After the ball of light descends from the sky, a huge supernova-like blast occurs, blinding the family trio. When they finally open their eyes, they see that the light contains a humanoid figure. And as it materializes, it crystallizes into a naked human female form.

She walks toward them, and Cole says that his final evidence is "Exhibit number 3: an alien." She collapses, and he approaches her fallen form as his father and his twin call him back.

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(Kim Woo Jin= Cole Parker
Kim Bum Gyun= Cameron Parker
Father= Anthony Parker
*The above are the character's names in this book which have a different Korean name in the original drama*)

Ten years later, a college-age Cole walks past the crowd of protesting Handam Science and Technology University students while another classmate calls after him. He ignores the calls and makes his way to a classroom where only he and Professor Erik Hall are present, and he proceeds to take an exam.

As soon as he walks out, he's confronted by his some other classmates, who heckle him for not upholding their boycott of the exam. The boycott was to show support for the protest that's happening outside to urge the school's president to step down for condoning brutal academic competition and fostering a harsh learning environment.

However, Cole isn't having any of it, because as a scholarship student, he needs to stay at the top of the class to maintain his free tuition. So he sarcastically quips back a thanks for an easy first place exam when the others try to make him feel bad for his choice to take it. As he leaves them, a phone call from his grandmother's hospice reminds him that he's late on this month's payment.

We next see him adjusting his makeup in a mirror, since it turns out that he's working a part-time job as a female ghost in a haunted house. He scares one child who begins to cry, and immediately feeling guilty for scaring him, Cole begins making funny faces with two lollipops. But this only serves to make the elementary schooler cry harder, and so Cole gives him both candies as he scientifically explains the fear of supernatural entities away.

Later, while eating his dinner of instant ramen noodles alone, he receives a text that his senior, Liam, is dead. His group chat log becomes inundated with messages like "RIP Liam" and "You will be missed." But Cole has only one thing on his mind.

The following morning, he goes to Professor Erik's lab (where Liam had been working before his untimely death) and asks if the professor is picking a new research assistant. Cole offers his candidacy, and the professor, glancing at the mementos still piling on the late Liam's desk, is shocked and taken aback by Cole's request. He tells him so, and Cole understands, but he re-emphasizes that he wanted to be considered before any other student was in the running.

A senior who had been watching this entire situation unfold with outraged disbelief corners Colr as he leaves the lab for being so insensitive about Liam's death. He pushes Cole against the wall and tells him that it was mercenary academics like him who caused Liam to commit suicide.

However, Cole doesn't just take this sort of condemnation and fires back at the senior: "Do you think the world is so easy? Because you've lived your entire life privileged, you took advantage of Liam too, taking credit while he did all the work. Isn't it too late to pretend to be a good guy?"

Cole pushes past the senior, but in an attempt to rile him up and get the last word in, the senior asks about Cole's older brother, -yeon). That makes Cameron, and his mind goes back to a flashback to his high school days where he went to the police station to see his brother in handcuffs.

Turning around, Cole replies to his senior that his brother is still in prison, and he adds that if they do end up working together in Professor Erik's lab, he won't be able to take advantage of him as easily as he did Liam.

As Cole is about to leave campus grounds, he passes by the memorial for Liam and overhears the detectives talking to a student who had witnessed Liam's last moments. The witness tells the cops about a boy with a taser who was seen with Liam before he died, and this makes Cole remember that Cameron had always reminded him to carry a taser in case of another alien attack. This prompts him to go to the rooftop, where another memory surfaces of Cameron threatening a female student with the taser, accusing her of being the alien.

Back in the present, Cole looks down toward the memorial from the rooftop, and he sees a figure wearing a black cap, and the figure clearly reminds him of his brother. He runs down several flights of stairs to catch the figure, but when he finally gets there, the figure is gone.

He comes home to see a pair of shoes that aren't his own, so he glances around, and his brother comes out of the bathroom with a huge grin on his face. Cole asks suspiciously how he got out so early, and his older brother explains that while Cole may be a model student, he was a model prisoner, which earned him an early parole release.

A little suspicious, Cole asks whether it was his first day out and whether he visited Handam University, but Cameron replies that he rushed home straightaway. They exchange happy greetings in brotherly fashion, with good ol' chokeholds and wrestling.

They go out to eat chicken, and Cole watches his brother down the fried meat at an unbelievably rapid pace. Cameron tells him about the chicken dreams he had while he had been locked up before he gets distracted by a spam text.

When Cole asks where he got the phone from, Cameron avoids the question and just says he procured one. It's not a big deal because Cameron seems cheerful, and they take selfies together in commemoration of his release from prison.

At night, still suspicious of his brother, Cole rummages through Cameron's drawers looking for any sign of the taser, but Cameron wakes up and asks him what he's doing. Knowing that Cole is worried about his obsession with the alien, Cameron reassures Cole that he's gotten over it and won't cause any more trouble.

He adds that he's even been hired as a pastry chef at a bakery right near Handam University. Cole is surprised but happy to hear the news, and they laugh and wrestle together before going to bed.

On his way to school, Cole sees his brother working at the pastry shop through the window and is relieved that Cameron was telling the truth.

He reports to Professor Erik's lab, where he's told to wait a moment. But when he looks at all the flowers and photos that have piled up on Liam's desk, he notices a familiar number on the wall. Typing it into his phone worriedly, Cole realizes that it's the same as Cameron's new phone number, and so he calls his brother up to ask whether he knows anyone at his school.

When Cameron replies in the negative, Cole becomes even more suspicious, but he tries not to hope for the worst as he asks his older bro when he'll be leaving work. Cameron says he'll be off at 8:00 p.m., but Cole has been staking out near the bakery and sees his older twin leaving much earlier than he said he would. Cole follows him to a seedy motel and sees him locking up a particular room.

Once Cameron's gone, he breaks the lock with a fire extinguisher and finds that his brother has been up to his regular alien-tracking activities. The entire wall is covered in clues and maps regarding on the alien's whereabouts, and when he looks through the drawers, he finds the taser.

That's when his brother comes in, looking guilty, but when Cole asks him directly if he's the one who killed Liam, he denies it vehemently and says that it's the aliens who took him.

Cameron apologizes for lying to him but insists that he's found proof for the existence of aliens, while Cole just looks like tired of this old rhetoric. The older brother brings up their broken family: "You know the alien took Dad. Don't deny reality." However, Cole tells his brother to come back to the real world and face the truth: Their father left them.

The scene goes to a flashback where they both watch as their father leaves them behind... while in his car, the alien woman sits in his passenger seat. Back in the present, Cameron promises that this time, it's for real—he's found the alien hideout, and it's on the second floor of the building above his pastry shop (which is why he started working there). Cole, half-knowing that it's a wild goose chase, says that this is the last time, and if it's not the alien's hideout, Cameron will go back to the psychiatric institution.

When they arrive at the second floor alien hideout, it only looks like an abandoned office space. Seeing this, Cameron becomes frantic, looking around everywhere for the alien that isn't there. Cole grabs him in a desperate bear hug, pleading with him to please stay by his side and not add to his burdens.

But Cameron doesn't want to let it go, and in a low moment, he confesses he doesn't want to let it go because that would mean he really was crazy for all these years. But then he's back on his high and springs out to pursue the alien woman, convinced that they're only minutes behind her.

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As he walks in the rain, Cameron seems fixated on something and shakes his brother off as he tries to pull him back. Cole looks in the direction that Cameron is staring at, and sees her.

On the other side of the crosswalk, the woman who appeared to them from the ball of light walks under a pink umbrella. Cameron points at her, reminiscent of how Cole did ten years ago, and says, "Exhibit number 3: an alien."