Li Kaan reviews the video repeatedly. Suddenly, a picture is sent to her that's the image of the hammer that San sent her, with a circle drawn around a spot on the handle, accompanied by a note asking kan to check the spot he suspects is blood! She immediately examines it and sighs, certain that he is definitely the culprit! The image of Ree is the only one that comes to mind; she is certain she cannot dismiss the suspicion on him.
She feels a strong internal conviction that it's him, but she is puzzled why she is so certain when she doesn't have concrete evidence to incriminate him.
Arriving at school, after helping her classmates with some work, kan tells Hana that she needs to meet Ree again! However, Hana seems unwilling for her to continue the investigation, pointing out that kan she hasn't had time to properly share in the class work! Siv siv is also puzzled why kan is always going here and there. She suggests to Hana that they follow kan secretly to see what she's planning! Hearing this, Hana looks at Siv siv and asks, "Siv, do you think Kim is still close with that one girl?" This question startles She wonder ,Why would Hana ask that? Does she know? It can't be; if she knew, she would definitely be angry with me!
"Siv ? Siv?" "Oh! Which girl are you talking about?"
I'm just worried about the girl who is in Kim's class. I'm afraid Kim might lie to me again!" Hearing this, Siv siv feels relieved and forgets about her curiosity regarding kan's activities!
"Class President!" ,Kaan calls mutu, whispering that she has found the main suspect! Hearing this, he is intrigued. He pauses his work and gets the hammer, which was wrapped and stored in a cabinet, to give to kan as she requested.
The two go to a quiet place to talk. The Class President is very curious and asks kan to tell him, hoping he can help! Seeing his willingness, she tells him the story, explaining her suspicion of Ree from class 11C. She shows him the video and explains her deductions and suspicions about ree!
"The problem is, did you clearly ask him what day he got that hand injury?"
"I'm certain it's him! But what if he lies when asked?"
The Class President laughs at her, never having seen her talk and question so much! Hana watches the two of them from a distance! Anyway, the Class President rubs his chin as if he has a long beard like a scholar. He says, "In the movies, if someone still lies to the end, there's only one way: DNA testing," then he shakes his head and laughs so proud of himself, "It probably won't come to that; we're just students, and it's a small issue!" But suddenly, he sees Hana smiling!
"Don't tell me you want to do that?" Seeing kan nod immediately, the Class President scolds her, "Why would you think that way? He denied it many times, and you're trying to force an answer! He's probably not the one!"
Li kan agrees, but she thinks that if she presents the evidence the bloodstain, the hammer, and the video the problem is she needs to describe the video and his actions in detail, especially because she is genuinely curious: Why did he do that?
"Li Kaan, you are not just suspecting him! You are already accusing him and fabricating a story to fit!" Seeing the Class President say this, she feels discouraged, but realizes she might be rushing things, perhaps wanting to quickly finish and close the case without caring about the truth! She sighs, then decides, "I still want to know. If the result proves I'm wrong, I will sincerely apologize to Ree from my heart for suspecting him!"
The Class President understands and says if she wants his help, he will help with the testing. But he needs to do more research on whether the test is possible or not. But kan needs to bring him some of Ree's hair!
Meanwhile, Ree is doing his work when suddenly someone calls him.
A female voice by sweet and soft on the phone says: "Ree! Ree ah! Don't confess yet! Don't confess anything until she has clear evidence about your case!"
Hearing this voice, he is deeply moved and happy that she called him, even though it was from an unknown number!
At that moment tuna came to Sara class that's make Sara dropped her phone and go out the class with tuna as usual everyday that tuna must to came to Sara class they act look like friend.
After the call ends, he is about to go back into the classroom, but he hears Li kan calling out to him! Seeing her, he raises an eyebrow as if he was expecting her! Li kan introduces San to Ree. Then she begins questioning him, trying to get him to confess. But Ree is firm, and his face is calm; he maintains his composure because he hasn't done anything! This makes kan more annoyed, and she thinks that his DNA testing method is not wrong; she will definitely do it! Thinking this, she says aloud, "In that case, to confirm further, may I cut your fingernail a little bit?" Ree looks puzzled, thinks for a moment, and realizes what she's trying to do! But he maintains his calm demeanor!
"It's good that you cooperate." But Ree is about to get up and leave, San grabs his shoulder to make him sit down, and discreetly plucks a strand of Ree's hair without him noticing. But did Ree really not know? Ree knew, but he pretended not to know, and San also knew that Ree knew. Anyway, she asks him again to cut his fingernail, but Ree refuses and walks away, leaving with the words, "Even if you take my hair, it won't yield any results. Didn't you clean the class and the curtain already?" This question sounds like he knows beforehand. Was he caught by coincidence, or was it intentional on his part? This phrase stuns both San and kan! She is now convinced it is him!
They walk back, feeling exasperated. Kan tells Hana everything and asks, "Is Ree's personality suddenly this serious and secretive?" But Hana denies it, saying that from what she's seen, he's a shy, gentle, and approachable person! Hearing this makes Li kam realize that Ree is definitely hiding something bad!
Tomorrow is the Festival, and she still hasn't figured out the truth!
Mutu comes over and says that the best results for the test require two to three days but….,
Before he can finish, kan hands him the hair wrapped in a plastic bag. However, her face is downcast because, "The blood on the curtain and the floor has been cleaned!" She tells Mutu about that problem. Seeing this, he thinks for a moment and says, "If he was injured, he must have been cut by the window glass when he broke it forcefully. So the glass must have been stained with blood!"
"But I searched for the broken window glass the other day, and there were no pieces left. They probably swept it up and threw it away!"
Ah! "In that case, we're done for; we needed his blood!"
"But what if the blood is just a stain and doesn't contain the liquid blood anymore?" She shows him the hammer and the bloodstain on the handle. Seeing this, the Class President laughs! He asks, "Is this really kan? Why do you always come up with unexpected solutions?" The two of them seem to talk a lot, which makes their classmates curious about them. Mutu asks to take the hammer and the hair for now, as he knows someone who works in that field, and his father conveniently works there. He adds that Kaan shouldn't get her hopes up too high. Then she just smiles and thanks him. In her heart, she hopes this matter will end soon. She praises herself, thinking, Maybe I should study criminology when I finish school? She's just joking. At this stage, she is somewhat relieved to have solved one part of the puzzle! But one question remains: If it is Ree, why did he do it?