In San's class, they are helping each other set up the classroom and plan what to sell. Dan tells his friends he wants to go to the bathroom for a moment. In reality, he wants to go find likan. On the way to kan's class, Dan encounters Hav's former henchmen, who are now openly Hav's subordinates. When they see Dan, they want to hit him, but kan calls out to Dan, preventing a fight! She warns the former henchmen, "You got lucky this time, but don't count on it next time!" As the group turns to go back to her, they see Hav and vud walking towards them. The group quickly disperses.
We will refer to this group as "The Rotten Group."
The Rotten Group is extremely annoyed with kan. They talk among themselves, wondering why Pud hasn't answered their calls. They were waiting for him to assign them another job, but there's been complete silence from Pud! One of them says they shouldn't worry, as they made a lot of money from the few days of work they did before!
Meanwhile, kan and Dan are looking for a quiet place to talk , suddenly they are stopped by vud.
"Senior! Senior! Did you forget what happened the other day?" Not wanting the matter to escalate, Kaan sighs, turns, and walks up to Hav.
"Sorry! Sorry for using your name(hav's name). Sorry for falling because you tripped me. Sorry for being terrified because you threatened to break my neck and leg. And many more things. In short: I'm sorry! Are you satisfied?"
A burst of laughter erupts. It's vud, laughing and saying he has never heard such a strange apology! While laughing, he turns and sees kan and hav looking up at each other face, which remains stoic and expressionless! Seeing that the two are about to clash, vud and Dan separate them. Dan apologizes to Hav, saying he was wrong and misunderstood that Hav was the one ordering those students to threaten him! Hav walks away without saying a word.
Kan mutters along the way that it's the first time she has seen someone with such a bad personality! Dan asks did you planning to continue the investigation? She doesn't deny it. Just then, Dan notices the bruise on her face. He is very concerned and asks what happened. She just laughs and makes up an excuse, not wanting anyone to know! She says she was playing with her friends and they got carried away. She thought Dan believed her, but when she turned, Dan had a look of disbelief. Still, she doesn't tell him.
They talk under a tree with a bench, getting straight to the point. She tells him what she found. "Dan, I think there are two people involved in the broken window case. The first one is you, Dan, who caused the window to break." He decides to tell the truth, confirming that he did kick the ball very hard at the window, which likely caused it to break. "I kicked it, then retrieved the ball and ran away without looking closely!" she says, "That confirms it." She describes the situation when she was alone in the class.
"At first, I thought I was alone, but after looking at the broken window glass, I was suspicious!" She tells him everything, including the Principal wanting to deduct his score. Hearing this, Dan scolds her, "Why are you helping me? I'm the one who did it; I'll take responsibility!" she replies, "At first, I didn't care, but I was too curious about who the real perpetrator was, so I agreed to investigate again!" he laughs, "How could you be so brave as to help me, when the only certainty is that the window was cracked, and yet you dare to claim I wasn't the only one who broke it?"
"However, I found two more clues! The bloodstain and the hammer!" She shows Dan the picture of the hammer. He zooms in, seeing the black handle, which is seemingly featureless. But Dan keeps zooming! While zooming, suddenly…
"What are you two doing?"
The voice startles them. San almost drops the phone, but luckily, he catches it. Seeing the two stunned and seemingly hiding something, San looks at the phone and sees the picture of the hammer!
"Oh, it's just a picture of a hammer! What are you looking at?" kan and Dan cooperate, smiling and nodding in agreement. "Yes, yes, it's just a hammer, nothing else." she changes the subject, asking San when his next football match is. San replies, "It's this weekend, during the holiday. I hope you'll come and watch!" San looks confused and asks about the hammer again, "Are you two hiding something?" Both of them deny it simultaneously. This only makes San more suspicious. San looks disappointed
"Fine!" she is about to answer, but Dan cuts in, "Do you guys want to go eat?" San glares at him, indicating that Dan shouldn't change the subject; he knows better. Kan tells San that she is secretly re-investigating the real culprit who broke the window. San asks again about the person who confessed, but she gives the same answer: "I don't know; that person confessed by themselves!"
"If that's the case, why do you still think there's a real culprit and that the confessor is fake?" This question is difficult to answer. She pretends to plead, "Can you stop thinking and asking? Can you just help me?" Seeing kan plead, San can't refuse, as he just wants to spend time with her!
"I need to be clear: NO ONE ELSE must know about this, please! So, I'll just tell you upfront: I want you to help me find the real perpetrator." She recounts to San what she recently found and tells him about being in the class when the incident happened! In short, she and Dan still lie, not letting San know the initial discovery kan made about Dan.
Seeing this, San feels much better when kan doesn't tell the whole truth. They part ways, with kan promising to chat (chat talk Facebook messenger)then and Dan if anything comes up. Feeling a bit relieved, she sees Sara's group walking but still continues on her path, pretending not to see them. They are annoyed by kan's attitude! Sara says, "Don't worry, she'll regret it soon!" Her friends look at her, wanting to know more, but Sara just laughs and tells tuna to go buy her some orange juice! It's a habit now for tuna to buy things for Sara with her own money.
At the cafeteria, there's a drink stall. Tuna goes to buy the juice. She notices the sneering looks from her classmates and the boys who have crushes on Sara. It makes her not want to look them in the eyes. She lowers her head, trying to look normal. As she takes money out of her pocket, someone takes out their money and buys the drink for tuna instead, handing it to her! It's Tan! Tuna smiles, and her eyes show her gratitude! Kan also comes to the cafeteria with Hana and Siv siv. Kan is very confused, wondering when they became close! Hana looks intently at kan .
Hana whispers, "Kaan, are you secretly in love with Than?" she is startled and immediately denies it. Tuna sees them and calls out, "Senior kan!"
"tuna, why did you let yourself be tricked by this person?" tuna smiles, holds kan's hand, and says, "No, he's just nice and paid for my drink!" Then she takes kan's and tan's hands and joins them together. She quickly pulls her hand away, while Than acts normally and walks away. Tuna turns to smile at kan and walks off! Hana watches tuna from a distance and smiles, thinking something to herself! Siv siv and kan go to buy something to eat. Meanwhile, Hana, who never speaks to tan, asks him, "Why do you like to keep quiet?" Tan looks at her, intending to reply, but Hana turns away and walks toward Siv siv and Kan, saying, "I went to his house with the Class President that day, but unfortunately, we didn't find it!" Saying this, she walks away, leaving Tan to just watch Hana from afar! It looks like they know each other, but ever since Tan transferred, Hana has never spoken to him because he's always alone.
They return to class and meet a Grade 11 student who often comes to Hana to check and correct his homework! They both exclaim, "Oh?" Hana asks, "Do you two know each other?" The junior says he saw Senior kan when she went to the 11th F class and another time when he couldn't find Senior Hana, so he asked Senior kan On day! Kan nods. That day, kan learned his name is Ree. Ree comes to Hana again for help checking his homework! While checking, Hana asks Ree about the wound on his hand, "Has it healed yet?"
"Yes, it has healed, but there's still a scar!" kan looks and exclaims, "That's a big scar!" Siv siv suggests a cream for scars. A moment later, they part ways to their respective classes. Kan looks deep in thought. Hana sighs and shakes her head, thinking kan shouldn't have continued the investigation.
It's time to go home! Yin (a boy who work with kan) stops in front of her and offers her a ride. Kan says, "It will probably rain today because Yin is being unusually nice!"
It's sister khai birthday today! She is surprised. They plan to buy a cake for Sister khai. And she chats to San, calling him a bad nephew for not knowing his own aunt's birthday! As she is riding on the back of Yin's bike, someone pulls her phone away. She is terrified, thinking it's a thief, but the person just pulls it away so she doesn't stare at her phone too much! It's him? Yin turns to look, while the person waves at her. It's too strange for kan! Yin jokes that she seems popular now! Kan sighs and says, "No!" She goes quiet. Yin changes the subject, asking her what's wrong. "I don't want anyone to see or notice that I talk to too many people!" Yin immediately stops the bike, causing kan's face to hit his back painfully! Yin turns to talk to her, "Why do you think that way?"
Kan asks him to continue the ride. On the way, she says, "It doesn't feel fit for me. And it's not that I'm afraid of being popular, I just don't like it. But what you said, I don't know if others see it that way, but what you said makes me dislike that side of me! It's not your fault, Yin, and I'm not blaming you. And I don't hate myself, I just don't like this popularity thing. To be honest, I used to feel sad when I didn't have many people to talk to or wasn't popular like others, but when Yin said that just now, I feel like I don't like that side of me anymore! Oh! Yin, you probably don't understand. Yin, do you understand?" Yin is stunned, as he only said one word, yet she has said so much! However, he replies, "You should test yourself first. If you can't overcome this, don't take on any big tasks!" she wants to choke him! Who does he think he is to lecture me, acting like I'm his child? She is extremely annoyed with Yin.
Work seems normal. Yin and kan cooperate, wanting to surprise Khai but they don't know that the boss itself has prepared something for Khai. When it's time to leave, the two of them try to delay khai, but they are clearly bad actors. Khai catches them and says, "You don't need to do anything; the boss prepared something for me!" Yin glares at his uncle, the boss. After Khai asks kan and learns about their plan, she laughs heartily. Khai suddenly asks them, "Did you two ride your bike together?" kan is stunned. Yin replies, "I saw her on the road, and she asked me to ride with her!" kan looks at him, secretly admiring Yin's ability to be a savage liar, even though he was the one who offered her the ride first! That night, they celebrate khai's birthday. Suddenly San arrived . Afraid that their secret will be exposed, Kan quickly whispers to San, "Don't let khai know that Yin and I go to the same school!" San sighs, asking why. But she threatens him to just follow orders! She then gives Yin an 'OK' sign, indicating she has told San! They look happy, even though they went through many new things that day.