The sound of the wooden door closing softly indicates an intention not to disturb anyone. Siv siv closes the door gently and heads to the kitchen to clean the dishes soaking in the sink after the family's lunch. After washing the dishes, she gets ready, carrying a cross-body bag and dressed neatly. Her mother, who is resting after lunch, asks, "Why are you going to school so early today?" oh, I'm going to Hana's house to wait for her. Her mother doesn't ask further, only advising her to be careful and not forget to buy some fried noodles for her sibling on the way back from school. She hands Siv siv some extra money.
While walks out she receives a call from someone.
Siv siv: "I know! Don't push it too much. Anyway, I shouldn't be meeting you again!"
A while later, she gets off the bus in the city, where people are bustling, and walks toward the gate of a private school( rich student of rich person study there). Suddenly A person waves at her, signaling that they are there. Seeing him, She walks over with a gloomy face. It's Kim. The two go to a quiet spot to talk. Kim grabs Siv siv and hugs her, as if he missed her a lot! "It's been a long time, Why didn't you text me? I tried texting you, but you didn't reply! Are you angry about me getting back together with Hana?" She start looks at him, angry and exasperated. She pushes him away and asks is he called her here to talk such nonsense? She continues, "I came today to make it clear that we must end our relationship."
"It's true that I loved you and met you before Hana! You know that, yet you chose Hana as your girlfriend and still secretly dated me. When Hana broke up with you, luckily she didn't know about me. Maybe I was stupid because I loved you too much, but let me tell you, I'm not stupid anymore! You hurt my feelings many times! Now that you are back with Hana, please don't backstab her the way you backstabbed me before!" Kim listens but doesn't get angry; he tries to hug her again, but she refuses and walks away. On the way, she deletes the new Facebook account that she used with Kim. Kim reveals that he asked to get back with Hana because he needed Hana to help him! But she gives him the middle finger and walks off, angry and disillusioned.
She feels guilty for backstabbing Hana, but now she's done being foolish! She doesn't blame Hana, because Hana didn't know at the time that Kim was the person that Siv siv had a secret crush on from another school. One day, Kim came to their school, saw Hana, and got to know her. He also saw Siv siv, who had previously confessed her love to him, but they pretended not to know each other cause that time she was got rejected by him, Kim got closer to Hana and asked her out. Hana, not knowing anything, agreed! This hurt Siv siv deeply, but she still decided to hide it and pretend not to notice. Later, Kim used the excuse of apologizing to Siv siv for rejecting her and embarrassing her before. Using the pretext of apologizing as Hana's boyfriend (who was Siv siv's friend), he slowly won her heart, and the two began secretly dating. Later, she heard Hana broke up with Kim. She was terrified that Hana might find out, but luckily Hana didn't. And was afraid of losing their friendship . but She continued dating Kim in secret, feeling guilty but driven by her love for him. Then Kim broke her heart again by asking to get back together with Hana! This stunned Siv siv! A few days later, She realized this was the opportunity to pull herself out! She decided to end the relationship with him and is doing it today for good!
While on the bus, she sits lost in thought, afraid that Kim might tell Hana about their relationship! She sits, watching the scenery flash by. The bus arrives at the stop. Everyone has gotten off, but she is still there. Suddenly, she snaps out of her daze when someone calls her!
"Senior?" Are you not getting off? It's Sara. She asks with a smile and seems like concerned look! Siv siv start looks at her, wondering about the coincidence. She gets off without speaking to Sara, knowing that Sara abuses the girl named tuna as what's she saw before.
As she gets off, she sees Sara's group waiting for Sara. But Siv siv is alone and feels a bit intimidated, because she knows they abused tuna, but no one else knows, as they are good at pretending tuna is their friend.
Sara tells her friends that she coincidentally met a Senior who is friends with Senior Hana! They turn and see Siv siv walking quickly away! Sara says her mood is very good today. "Just wait a little longer, we'll see something fun!" she thinks to herself. Her friends ask is anything good happened, as Sara seems happy this morning. Sara replies that she feels her monthly exam results will be good for her! So they are happy and wait for the results.
{At school}….
"Oh! You're here?" "Hmm!" Hana checks Siv siv's bag, looking for anything she might have brought to eat, but there's nothing. Hana looks disappointed. Seeing this, Siv siv takes Hana out to eat! And She asks about kan. Hana says kan is a girl obsessed with investigating! Suddenly, she realizes she slipped up and spoke out loud.
"Investigating what?" "Oh! Investigating why they abused tuna!" And she talks like a child, "kan has abandoned us now!" Seeing this, Siv siv is looking Han a so cute! They go to the canteen to buy something to eat. Siv siv doesn't tell Hana that she met Sara's group just now, afraid Hana might ask why she took that bus route.
It looks very lively today, as next tomorrow is the Festival holiday! The school grounds look beautiful, preparing for the event the day after tomorrow. All the students have their own tasks and walk around with their friends. Only kan is walking around, looking for something! She walks to different classes and asks each homeroom teacher if the classroom cameras are working. After getting the answer that they are working normally, she asks to watch the footage, even though she knows it's useless, as the camera in her own class cannot capture the person she is looking for! She starts watching the video from before the break until she sees students leaving. Suddenly, she sees Ree! He walks by, holding a book and papers, passing the class next to hers. She can't see what happens next! Wanting to know more, she continues watching the video. Then she sees herself walking out, intending to go downstairs. Her actions look like she's looking left and right and rushing down. That's when she saw the broken glass and quickly go to watch and left the class to go downstairs! A moment later, she sees Ree walking out again with the same book and documents! She tries watching many times, but sees nothing strange! However, Ree is the only one seen entering and exiting that area during the incident. So, she has no choice but to question Ree. Before leaving, she asks for a copy of the video.
There are many questions she wants to ask about Ree, as she only saw him a few times. But if he is the one, what was his motive? There's no reason for him to do that!
Kan meets Hana and they talk quietly.
"Hana, I found a video of Ree walking past the class next to ours just before the incident!" Kaan shows the video. Hana is surprised and says, "Maybe he came to look for me, couldn't find me, and walked back?" "Maybe! But if he didn't find you, why didn't he come back right away? Maybe he went to the bathroom?" Hana says, "No need to wonder too much. Just meet him and question him." kan nods. The two of them go to meet Ree. Hana is not close to Ree; he just asks her for help with homework occasionally, and Hana helps. Anyway, she knows Ree's class is 11C. Upon arrival, they see vud and Sara are also in that class. Seeing this immediately, Hana calls a junior student named Sina, the Class President of 11c.
Sina: "What can I do for you, Seniors?"
"Are you the Class President? Could you please call Ree for me?"
"Ree?" Sina calls Ree, telling him two Seniors are looking for him. Ree turns and rushes out to meet them.
Ree: "Seniors, you're looking for me?"
"Yes! We have some questions!" The three of them sit under a tree to talk. We see vud(hav's subordinate) and Sara watching them from a distance. Kan immediately shows the video. And ask"Why did you go to the 12th-grade area that day, especially near my class, or to the bathroom near my class? If you went to the bathroom, why did you have to come to this area?" Ree listens for a moment and answers clearly without hesitation: "That day, I came to see Senior Hana, but I didn't see anyone! And I went to the bathroom. A moment later, as you see in the video, I walked back out! Do you need anything else, Senior?" kan and Hana look at each other. Hana asks, "Why were you looking for me that day?" He replies that it was for the usual reason: he wanted Senior Hana to check his answers. Kan notices the long, scraped-like scar on his middle finger.
"Oh, this scar is from cutting my hand at home." she wants to question him further, but Hana stops her, seeing kan acting as if she's interrogating him! Anyway, Hana tells him, "Next time you come to see me, come during the second break; you'll find me then."
Back in her class, kan still feels uneasy. Ree is the only one who was there that day. She questions herself: Am I suspecting him or just accusing him to end the matter easily? She shakes her head slightly, telling herself she can't just accuse him carelessly. After work, she sits and watches the video again many times. Suddenly, she notices something strange in the video: when Ree walks in, he is holding the book with his right hand, but when he walks out, he is holding the book with his left hand! Her first thought was suspicion, but then she rationalized that he might just want to switch hands. However, in the first video, he doesn't put his hand in his pocket, but when he comes back out, his right hand is in his pocket! She sees that his left hand has no visible injury. She recalls the bloodstains on the curtain and the floor. She mutters, Is he hadn't put his hand in his pocket?, I might have seen it, and if there was no injury, I wouldn't suspect him. But since his hand is in his pocket, she doesn't know if his hand is injured or not. She sighs and goes to sleep. At first, she can't sleep, but after tossing and turning, she falls asleep. It seems she is tired of this investigation, which is becoming bothersome for her, and others might be tired of it too if they knew she was still investigating. But although she is tired, she still wants to know who is so good at covering their tracks!