Daniel buried in the mud and struggling to pull himself out of the ground. After a few attempts, he’s finally able to push himself up and escapes from the mud that he was trapped in just seconds earlier. He stares at himself in confusion and fear and finds himself abandoned in the muddy tracks of a paddy field. Daniel is uncertain as to how he got there or where he is.

Two days before the incident. Daniel is busy moving things out of his detective agency along with colleague Sam. As they bicker back and forth about the couch that they’re selling, Daniel notices a car passing by that arouses his suspicion. He urges Sam to place the couch back inside the building where it belonged so they hurry and take the item back inside. Unlike what they originally thought, they no longer will have to sell the couch. They’ve got clients who need their help.

Upon meeting the client, Daniel and Sam learn more about the case the client wants them to pursue. She starts off her story about two missing children named Aria and Cairo so Sam assumes she wants them to help her find the two kids. However, Daniel gets right to the chase and is aware of the real reason why she’s here. The woman they’re talking to isn’t the client but rather just a proxy. The real client is the CEO of a company who lost his own daughter and wants our two detectives to find her.

Daniel heads outside to where the CEO is patiently waiting inside his car. Daniel is aware that the CEO is being threatened by his daughter’s kidnapper and asks for the letter given to the CEO by the kidnapper. After reading it, Daniel suggests that the CEO report his driver to the police. The driver might not have done the kidnapping, but he did write the letter and stole some of the CEO’s money. The driver took advantage of the situation to earn some benefits.

At the police department, chaos ensues upon news that the CEO’s daughter is missing. Some detectives are ordered to search the CEO’s driver’s house while some others are to study the letter that he wrote.

Daniel and Sam agree to solve the case involving the CEO’s missing daughter for 2 reasons:

1) they too don’t trust the police force, and,

2) they don’t want to move out.

If they successfully find the culprit, they won’t have to move out of the building nor ever pay rent for it ever again. Even if the CEO’s daughter Claire is found dead, the contract still remains valid. The two investigators are also to prepare a lawsuit against the kindergarten that the three kids attended since they’re working for the CEO’s legal team.

Police investigator Luca and his team head to the driver’s house to search for any clues or hints as to the disappearance of the three kids. Though they find nothing in the house, they do discover a bag of money hidden in the trunk of the car. They conclude that the driver was paid money in exchange for delivering Claire and her two friends to the kidnapper. In his interrogation, the driver denies any accusations of committing ransom. He claims that Claire had disappeared by the time he arrived at her ballet practice to pick her up.

Daniel and Sam visit the playground where Claire’s friend was last seen. The mom searched both exits to the playground, but the kid was nowhere to be seen. That meant that there must have been another exit that the kidnapper took to escape the public eye. That’s when Daniel and Sam then discover a path in the bushes leading to an underground sewage. Sam questions how a person can fit through the small pipe, but Daniel adds that it might not have been a person.

The two private investigators continue their search by stopping by the ballet academy that Claire attended. While Sam interviews the ballet teacher, Daniel talks to Miya, one of Claire’s schoolmates. She shares with Daniel her fear: she’s afraid she’ll be visited by Bori. Though it’s unclear who this Bori is, Miya confides in Daniel the secret that many others don’t believe her for. Witnessing the conversation between the two is Jung Olivia who’s stopped by the ballet building to deliver some yogurt drinks.

Daniel finds security camera footages of the three missing kids’s kindergarten teacher. In the clip, she dozes back and forth in the classroom. Daniel and Sam visit the daycare the next day posed as move-out specialists. While Sam keeps the principal busy, Daniel searches around the classrooms for any evidence. They then meet the kindergarten teacher herself and strike up a conversation with her about the class dog named Bori. Daniel notices the remnants of dog hair still hanging on her clothes that he also saw scattered around the playground the day before. They claim their imaginary friend Ashley can help find the missing dog if she just reveals to them when it was last seen. After flipping through her journal, the teacher shares that Bori was last seen the day before the kids went missing.

Daniel and Sam can’t seem to fathom or understand why three kids from the same kindergarten would go missing. They also try to gather more details about the missing dog Bori. After studying enough of the kindergarten, they exit back to the building and pass by a working Olivia. Daniel has something else he needs to check up on first.

Olivia makes her way to the police station where Luca and his colleague works. She drops off some ginseng extract to the two men before leaving. On her way out, she encounters Miya and questions why the little girl is here. Miya hands Luca a picture of her with Aria and Bori and claims that Aria chased after Bori the day she went missing. Detective Luca doesn’t buy Miya’s story so easily, but Olivia notes that it’s worth following. However, Luca isn’t persuaded and he pleads for Olivia to leave.

With the hints gathered about Bori, Daniel revisits the playground where Aria was last seen. He imagines the moments leading up to her disappearance and sure enough, he concludes that Aria did chase after Bori into the bushes only to also disappear into the bushes right after.

In the basement of a building, a woman storms down to check up on three separate boxes who she’s trapped our three kids inside. As she yells at the kids inside the boxes to quiet down, she opens up one of them and freezes upon what she sees.

Daniel updates Sam on the new details he’s discovered. Aria indeed did follow Bori and was kidnapped afterwards. The buttons found near and inside the sewage belonged to Aria’s outfit. Daniel predicts that the kindergarten teacher must have been the one who abducted the kids. The dog hair also near the sewage was seen on her clothes the day they visited her at the daycare. Maybe the teacher abducted the kids out of revenge against the principal or parents or it could have also been a case of child abuse. Regardless, the chances of her being the culprit are high. She took the kids on a museum the day before they went missing so they can check the security camera footages planted there.

At that moment, the two investigators are interrupted by a visit by Olivia. She’s come for an interview based on the job ad that Daniel posted. The chief detective interviews Olivia and she presents to him all her work experiences and skills. She attempts to persuade him to hire her, but there’s just one more question that she needs to answer if she wants to be accepted. Daniel never posted a job ad about his private investigative agency; he knows that Olivia discovered him after seeing him at the ballet academy and outside of the kindergarten. So then, why does Olivia want to work for Daniel? What is it that she wants?

Olivia is recruited onto the team with Daniel and Sam. In order to obtain the security camera footages of the kids’s visit to the museum, Daniel and Olivia create a scene inside the museum and fake a scenario that requires them to check the CCTV recordings. The two are granted permission and view the security camera clips of the little kids with the kindergarten teacher at the museum. As predicted, the kindergarten teacher is seen yelling at the kids to be quiet and to behave.

The teacher and the principal get into an argument about the teacher’s decision to leave the job. This investigation only began because she was irresponsible in taking care of the kids properly. With the principal’s back turned towards the kindergarten teacher, the teacher suddenly feels the urge to strangle and murder the principal. However, she stops when she finds the teacher talking to her with black possessed eyes and a deep, dark, and evil voice. A ghost wearing a red dress creeps up from behind the kindergarten teacher and taunts her to kill whoever is investigating her.

After discovering the CCTV footage of the kids with the kindergarten teacher, Olivia suggest they report the teacher to the police for child abuse. However, Daniel refutes that they can’t just yet because they don’t have enough evidence. He sends Olivia home while he resumes with the investigation.

Daniel returns to the daycare and revisits Bori’s doghouse. He ventures a little further and finds an entrance to the basement. There, he discovers a petrified Bori and digs even further into the basement. Meanwhile, the kindergarten teacher battles her inner voices and demons. A part of her wants to kill the kids, but another part of her wants to let them go.