It is a family psychological thriller that tells the story of South Korea's best profiler who experiences a dilemma after learning the secret of his daughter who is related to Sha Ren's crime.

Han Seok-gyu plays the role of "Jang Tae-soo", South Korea's best profiler and a father who raised his only daughter. He is a legendary figure who started his career as a criminal operations analyst last year and is highly respected and prestigious within the police organization.However, due to a certain incident, not only his professional beliefs, but also his relationship with his beloved daughter were shaken. He is a character who fights alone to protect his daughter and uncover the truth.A perfect and respected figure professionally, alienated as a husband and father.

Episode 1

At the beginning of the play, there are bones

There was too little information for the male protagonist to analyze, which made the detective captain feel that the male protagonist was not working seriously and was very angry.

The male protagonist left the scene and hurried home, hurriedly cooking for his daughter for her birthday.

After cooking, he went to pick up his daughter from the cram school, only to find that his daughter had dropped out of the cram school two months ago and the male protagonist could not find his daughter.

The hero's daughter witnessed two girls stealing mobile phones on the subway, and helped cover up the incident, and also followed the two girls.

Due to a fight, the hero's daughter and two girls entered the police station. The hero's daughter observed the police interrogating them and said favorable words to make the police favor her.

The male protagonist rushed to the police station and asked about the incident. Since many stolen mobile phones were found, the police investigated.The two girls denied stealing the mobile phone and said that the hero's daughter wanted to join them and run away from home.The hero's daughter denies what the two girls said. The hero observes his daughter's micro-expressions and doesn't believe her!

The father and daughter went home. The daughter refused to eat the meal cooked by the hero and asked him to leave.

The male protagonist was transferred back to the headquarters to interview his successor.The male protagonist wanted to take care of his daughter and did not want to leave, but the director said there was nothing he could do. After the male protagonist interviewed, he admitted a male interviewer - Director Gu Dahong also admitted a female interviewer (Li Yuzhen) on the grounds that there were many cases.

When the male protagonist came home, he saw his daughter walking with a certain boy and asked.Suddenly, he heard a vibrating sound from his daughter's cell phone in her bag, but her cell phone was clearly in her hand! The male protagonist asked his daughter to open her school bag, but the daughter refused. The man took the initiative to turn through the school bag and found the mobile phone.

The male protagonist asks someone to check his cell phone, but his daughter steals it back in the middle of the night

The next day, the male protagonist saw his daughter going out with her suitcase and thought that her daughter was running away from home. The daughter explained that the school had extracurricular activities.The police also proved that the hero's daughter did not steal the mobile phone, and that the hero saw a vision of his dead wife when he was drunk.The phantom of his dead wife accuses the hero of not believing in his daughter!

The male protagonist called his daughter but didn't answer the phone.Another crime - lots of blood, no body.The male protagonist asks his boss to participate in the case

The male protagonist and two new team members analyzed the case, and the male protagonist severely criticized the team members.

Late at night, Li Yuzhen and the male protagonist analyzed the scene and concluded that the murderer burned some evidence that might indicate the identity of the murderer.

Police find burned vehicle

The teacher called and the male protagonist found out that his daughter did not participate in extracurricular activities.Finally, the mobile phone was located near the new case! The male protagonist cut his hand, took blood, and made an identification. Fortunately, it had nothing to do with the victim.

The hero's daughter intentionally ran a red light and was hit by a car!

In the preview of the next episode, the hero's daughter mentioned that “Xia Jun” is the hero's son? Could it be that the hero suspected that his daughter had killed his son?

Episode 2

The male protagonist's family went out to play, and his son and daughter were playing hide and seek and disappeared.In the forest, the male protagonist, who was looking for his child, saw his daughter covered in blood and his son who fell off a cliff.The police gave the male protagonist, who was holding his son's shoes and crying bitterly, the buried handkerchief (the handkerchief used by children to cover their eyes while playing hide-and-seek).

The male protagonist doubted his daughter and questioned her, causing her daughter to be hurt.The hero's wife was very angry and divorced the hero.

The hero's daughter called her grandma, and the hero asked her daughter's purpose and where she went.The daughter avoided answering where she had gone.

The male protagonist hurried back to the police station to attend the meeting.The male protagonist saw the video of the car rental suspect and thought it was his daughter.Moreover, the phone number of the male protagonist’s daughter was included in the list produced by the cell phone towers around the crime scene.

The male protagonist looked at the red fiber evidence he found, ran home, and looked through his daughter's room.The male protagonist's daughter's door was marked, and there were two marks. The male protagonist only saw one, and the daughter knew that someone had entered her room.The male protagonist suddenly sees the red pendant on his daughter's schoolbag and breaks the cup.

The police found a video of the girl who rented a car. She was not the hero's daughter, but Song Min Ah, one of the two girls (Song Min Ah and Park Ji Yeon) who stole mobile phones on the subway.

The male protagonist recognized Song Minya, but did not tell anyone at the police station and secretly investigated on his own.The male protagonist found Song Minya's social account and made an appointment with Song Minya, but it was Park Ji-yeon and a man who came. The male protagonist did not show up, followed Park Ji-yeon, was discovered, and disappeared.

The male protagonist went home and questioned his daughter. The daughter cried and asked him to believe her, but then turned around and changed her face.The grandmother also made the male protagonist believe in her child.

The police arrested the man who was with Park Ji-yeon, Choi Young-min.Li Yuzhen and Gu Dahong analyzed the case and felt that the scene was very contradictory and Cui Yingmin might be an accomplice.

Li Yuzhen and the male protagonist went to inquire about Cui Yingmin's landlord. The landlord was injured and lied that it was him who hit him, but the male protagonist saw it out.The male protagonist was following Park Ji-yeon that day and was seen by the landlord.

Goo Dahong found out that Song Minya bought medicine to treat diabetes to lose weight. The medicine was also found in the blood of the victim. The victim was probably Song Minya.

The police originally arrested Song Min Ah, but instead arrested Park Ji Yeon.Park Ji-yeon used Song Min-ah's card. After Park Ji-yeon saw the male protagonist, she told him to let her go, otherwise she would tell him that Song Min-ah went to see his daughter.

Police now suspect Choi Young-min and Park Ji-yeon of killing Song Min-ah.But there was no evidence, and Cui Yingmin's mouth was difficult to pry open, so he had to let Cui Yingmin go first and then follow up and monitor him.Li Yuzhen and Gu Dahong investigated the case between Song Minya and the hero's daughter. Gu Dahong discovered that the hero was secretly investigating and hid the matter from Li Yuzhen.

Park Ji-yeon was released and told the male protagonist that the last time she saw Song Minya was on the 11th. Song Minya went to see the male protagonist's daughter because the male protagonist's daughter stole Song Minya's mobile phone.

The hero's daughter came to the police station to give him clothes, and when she got home she burned the red pendant.When the male protagonist came home and saw that the pendant on his daughter's schoolbag was gone, he asked his daughter if she killed Song Minya.The daughter asked the hero if he doubted the death of his brother and mother.At this time, Team Leader Wu came to the door with his team members!