Yong Goo, a mentally ill father who accused of murder and rape successfully brings in her 7 years old daughter, Ye Seung, of course with a help by some friendly criminals in his cell. In this cell number 7, they have a mission to protect these two Father-Daughter and also to prove Yong Goo isn't a murder.

This movie absolutely wins my heart. Every single scene successfully makes my heart flutter. Hats off to every actors in here, especially Ryu Seung Ryong ! His acting as a mentally ill father is really perfect. He isn't just bringing the character of a mentally ill father but also a character of father who loves her daughter so well. I also adore Kal So Won as Ye Seung child ! How can this cute little girl can act like that? She is very cute and smart, like her character. I can really feel the father-daughter bond.

Everyone must be thinking at first that criminals in cell with Yong Goo are bad, but they aren't. In the end, all bad person in cell, including prisoner chief, are helping Yong Goo. I think it's because a sincere love between a father and a daughter.
The movie started with a lady given a pile of files by a police officer who she later calls “Dad”. The files are for a case which the police officer said is gonna be tough because the case is not an easy one. Then the lady carrying the stack of files is walking out not just from a police station, but from a prison. It was snowing and she saw a balloon flying in the sky and got caught in the barbed wires.. It is because this balloon getting caught in the barbed wire tells so much about the undying love of the father and daughter for each other and the miracles that happened in cell no. 7.

The next scene is that of the lady having her fate foretold by a farce fortuneteller. She is not being annoyed by this and she seems to be playing with the fortuneteller and his assistant even smiling and laughing at the false fortunetelling. And then a girl who looks like a troubled teenager entered the room asking her father (the assistant) money. The lady looks like she realized something and happily said “you are Bongseon” like having known her for a long time. At this, the fortuneteller asked who she is really.

Then, in a church a pastor is in the middle of a religious service and he is saying a prayer that the people have to repeat. The doors of the church opened and it was funny because he said things which should not be part of the prayer but the people still repeated them.
The men who opened the door are the fortuneteller and the assistant we saw earlier. Then they presented the lady and the pastor said her name and so we learned that she is “Yea-Seong”.
From the surprised and happy faces of characters we have to take note of, we are given the knowledge that they all know each other from the past.
We are then brought to a court where we learned that Yea-Seung is a lawyer and she gathered those men to be witnesses in the case being heard in the court that day. From their conversation we get to know that they are all ex-prisoners because they are nervous and awkward in where they are sitting because they are more used to sitting in front of the judge where the accused are. In that hearing the police officer from earlier is also present. And they greeted each other in a way that we know they also knew each other from the past.
The hearing is for the re-investigation of a case of the accused Lee Yong-Gu. The prosecutor said that there is no more need for re-investigation because it has been proven in the past that the accused is guilty. Yea-Seung, the lawyer, defended the accused with the argument that the so-called evidences and confirmed testimonies are the mistake of this trial and must be looked back. The prosecutor is not the one in charge of the case in the past and his defense are based on fraudulent data made up by detectives long ago. The prosecutor asked the same question if the lawyer is the lawyer assigned in the past. She said no, but that she was definitely there.
And then we are taken back to the past. A father and daughter singing Sailor Moon theme song in front of a store where they are looking at a Sailor Moon bag they want to buy.

The little girl we then learned is Yea-Seong. She is sad because there is only one left of the bag. Her Dad promised that they will buy tomorrow because it is salary day. However, the bag left was bought by someone else. They tried to chase after the bag and tell the family that they’ve been looking at that bag for so long everyday even twice a day. But what a bad guy the father of that family is, from that encounter he should have known that Yea-Seong’s father is mentally challenged, but what he did is hit him. He hit him repeatedly despite the cries of Yea-Seong. He is the one who is educated and he is even rich but what he did was very unreasonable and discriminating. After the hits, Yong-Gu still did nothing but to plead for the Sailor Moon bag that it is Yea-Seong’s bag. How ironic that Sailor Moon’s theme song about justice is playing in the background while all this is happening.

Later that night, the father and daughter as they were about to sleep are talking about the bag. The father promised that he will buy the bag as gift for his daughter’s entrance to school. The daughter, at her young age understands fully the situation of her father. She said that it’s ok and for her father to not push himself to buy the bag.

In the morning little Yea-Seong sends his father to work. As little as she is, she takes care of her father well. The scene showed how much they love each other and how they take care of each other – giving her father boiled water and reminding him not to drink tap water, she even fixed the folds of her father’s pants, told him to eat proper meals, and her father warmed her hands and told her to go inside and be sure to eat meals as well. Then they said goodbye. And what comes next is an important scene showing their habit during goodbyes – Yea-Seong stays looking at her father’s back and at the count of three, Yong-Gu will face his daughter again, they will wave at each other and dance.

Yong-Gu is working at a parking garage, he still ate bread at lunch maybe because it’s cheap. And he was there counting his salary when the start of the unfortunate event happened. The daughter of the family who bought the bag earlier called on him asking if he has bought the bag. She showed Yong-Gu the bag, and he repeatedly says “Sailor Moon bag” and he must buy a sailor moon bag. The girl said she knows another store selling the bag and so Yong-Gu followed her.
And then suddenly, in a street, we see the girl lying on the ground and Yong-Gu seems to be doing something on her. A passerby mistakes this to a crime and screamed and of course we know what happens next given this situation. Yea-Seong is waiting at the bus stop for her father to come home from work. It’s already late but he is not yet coming home. Her father is in the police station accused of the crime of kidnapping, murder and rape. To add to the unfortunate event, the father of this girl is the Police Commissioner. Everyone is in an uproar, there are so many reporters, and Yong-Gu is saying he needs to go home because Yea-Seong is waiting and she will.....