In a year of 2024, Upon re-entering the school of Jooshin High School, there is a girl who is beautiful, rich, brave and most of all her kindness. She is Park Hye-ri, studying in America a year ago, and was able to record with honors and "Best in Honest" in her school. What is her role in life and who is that person waiting for inside Jooshim? As she held the photo, a boy, owned by the school and what is his connection with Hye-ri? Everyone looking at Hye-ri is one of the school transferers. When the bell rang, she immediately entered the school gym and it was introduced to the students there. When Hye-ri was nervous about it and she couldn't pass it up, she immediately gave courage to get rid of the nervousness. When Hye-ri notices the man, Hye-ri sees her former boyfriend named Bong Chan-young. Strong, handsome, rich and he is not a judgmental person. While Hye-ri and Chan-young remained staring them silently, the students immediately started gossiping and Hye-ri got off the stage so quickly that she just smiled. After introducing herself, she went to her classroom and looked for it until she found it was her old classroom. It turns out that they were classmates then and now, so they met destiny today. The class table she was sitting on then is the same now. This served as Hye-ri's memories of the events when she became a man. When she found a black ballpoint pen it was from Chan-young, when he gave it while Hye-ri's ballpoint pen was missing. It is a memory of the moments that were for each other. When Chan-young looked at Hye-ri as she held the ballpoint pen, Chan-young also remembered when she gave it to Park Jae-rim. So in his mind it is very impossible that Hye-ri and Jae-rim are one and the same.

Chan-young also remembered the times they were in the same classroom together, and he remembered when he gave him a ballpoint pen so he could write properly. When Hye-ri looked at his ex, she immediately looked away so she wouldn't be hurt by what happened, and Chan-young avoided Hye-ri because he didn't know her well. After class, they went to recess by 12 noon. Hye-ri is restless in this place where she eats. She remembers all about how Chan-young protects her from those who bully her while she eats. Another student is surprised by Hye-ri's actions and she avoids them in shock. Hye-ri promises Choi Soo-ho that Hye-ri prioritizes revenge is than all else. As Hye-ri ate, she was alone and had no companion or friend, so she preferred to be alone for neither of them had any doubts. When Chan-young goes to the dining room, with his friends, he notices that there are classmates eating alone when there is no one else, Hye-ri is one of them. When Chan-young asked this, "Hi! I'm Bong Chan-young, nice to meet you." Hye-ri was suddenly nervous and her heart was beating fast, so she just endured introducing her ex. She said "I'm Park.... (uhmm) Hye-ri." The two are shake hands so she didn't want to look into Chan-young's eyes. "Do you want to join me when you eat at the table?" Chan-young asked again. Hye-ri said "No, thank you, I don't want anyone to eat with me, it's a bit disturbing... I'm sorry." Chan-young let Hye-ri go and looked for another table where they were eating.

What will Hye-ri do when they meet each other again and Chan-young doesn't know that their new classmate is his ex-boyfriend. Revenge, justice or love???

After class, everyone went home, and Hye-ri walked alone. Chan-young notices Hye-ri walking home alone, here's what he said. "Hye-ri, come on, I'll take you.", Hye-ri said "No, someone picked me up, besides, (she got nervous) you should have looked after me, I want to be alone." (Chan-young closes the car window) he was shocked wondering why he did this, and it was also similar to what happened when Jae-rim came home from school alone and he gave him a ride right away. In the evening, Soo-ho and Park Seok-ryu surprise Hye-ri on her birthday. Hye-ri is happy with this, especially Seok-ryu, and they will be able to heal their feelings from the death of their parents. The two sisters stomped and cried. Hye-ri said "Thank you, especially you Seok-ryu, you never let me down in life's challenges. If it wasn't for all of you, I wouldn't be the woman I am today." (Hye-ri cries) Seok-ryu says, "For justice to our parents." (They shouted at the same time) "JUSTICE". "CHEERS" (sound of wine glass). Before going to bed, Hye-ri thinks about Chan-young's behavior earlier, first, he was looking at Hye-ri while writing with a black ballpoint pen, second, he was picking up students who would walk home alone. While Chan-young also couldn't sleep because of what he did earlier. He wondered if he did the right thing? Is this the last time he forgets Jae-rim?

In the morning, they received a mail, for Hye-ri. When Hye-ri goes outside the house, she finds out that she has been invited to Chan-young's friend's birthday party. Will Hye-ri still go or not?

At Chan-young's friend's house, there are lots of food, wine, flowers, classmates and so on, only sexy and informal clothes when swimming. When Min Seon-ok asked, "Are all our classmates invited?" The receptionist said "There is one left who didn't come sir." Seon-ok said, "Maybe that will come." Hye-ri says goodbye to Soo-ho and Seok-ryu who are going to the party and agrees. After 1 hour, Hye-ri arrives and turns out to be the one left invited to the party. The receptionist said, "Ma'am, Seon-ok was waiting for you." Hye-ri was realized that name. She said, "Who is Seon-ok?" The receptionist said, "He is the owner of the house and today is his birthday." "All right." Hye-ri said. When Hye-ri entered the house, the people here were all dressed informally and she was wearing social and luxury clothes. Hye-ri immediately asks "Where is Seon-ok?" A woman said "He's inside." "Thank you." Hye-ri said. "Wait, who else are we waiting for, man?" Seon-ok's classmate said. "That will come too." Seon-ok said. Seon-ok comes out and has something to say to everyone: "Hello everyone, I want to thank all of you who came here, and just enjoy my party." (People shouting). When Hye-ri looked at the crowd, her ex was there. He's just wearing shorts. Someone wants to invite to drink wine for Hye-ri. "You, come, join us." "She said, "Uhmm, not anymore, thank you, I'm not used to drinking." Others said, "Your killjoy, go ahead, it's only one time, that's ok...if you want more." (A woman laughs) Hye-ri hesitated and was ready to drink.

After 10 minutes, there was a truth or dare game for them, and Hye-ri was started, asking her "truth or dare", Hye-ri said "dare", and if she said "truth" they would know the truth. So she thought "dare". (Hye-ri got drunk) Hye-ri will go and her people follow her, then, while Chan-young and his other friends are talking, Hye-ri comes to Chan-young and suddenly the two are silent. And what's worse, the two were kissed.

Is this a sign of their getting back together or will she use Chan-young if he has anything to do with Hye-ri's mother's murder?

When Hye-ri and Chan-young were kissing, he suddenly pushed Hye-ri away. Chan-young said, "Are you drunk? I'll get some water." When Hye-ri is not acting properly, Chan-young's desperate girl suddenly appears. She is Gong Ye-jin, Chan-young rejected her before, and no matter what she does, Chan-young will not like her. Ye-jin said something like, "Wow, you flirty girl, don't you know that the man you kissed is now my boyfriend." Ye-jin gets angry and plans to slap her. Good thing that Hye-ri took Ye-jin's hand away. Hye-ri said something here that, "Excuse me, it's just a game, don't be stupid. Hahahaha. (Hye-ri walks out) Oh... wait.. don't you know also... that you're not like him because of your attitude, will he like you one day? wait..we're just playing truth or dare, why, am I planning to seduce Chan-young? Because... he has..." (Hye-ri could almost say Chan-young's reputation). Chan-young heard what Hye-ri said. "What did you say Hye-ri? I have?... (Suddenly stunned) What... (Hye-ri just laughed about this). "Nevermind. I'm leaving, and thank you for inviting me to the party Seon-ok." Hye-ri said. When Ye-jin turned to Chan-young about what Hye-ri was saying. She said here "What is that woman saying?" Chan-young said, "Nothing. And, can you stop me please..I don't need you." When Chan-young left the party, he decided to go home.

But unexpectedly, Chan-young wondered why Hye-ri was able to kiss him, when he and Jae-rim were together, so he kissed Chan-young several times. When he couldn't sleep well, he was thinking about what happened last night. Then he also slept well after.

When Hye-ri returns home, Seok-ryu and Soo-ho realize from Hye-ri's behavior that she is already drunk. Seok-ryu wanted to talk her but Soo-ho was handling, so she left Hye-ri alone until she fell asleep.

By 7 o'clock in the morning, Hye-ri wakes up and she was surprised that she is late for class, she rushes into shower and get dressed. When breakfast was ready, she took the lunch box and put the food in there to take to Jooshin High School. When she ran to her classroom, suddenly there was no one, so they did have a curricular activities, so they all went out, but what she saw, there was someone had left the notebook. When she took it, it turned out to be from Chan-young and she intended to return it. Hye-ri takes it and finds him to return it to his office on the third floor. When Hye-ri arrives on the third floor, she sees Chan-young and another girl were talking. But she couldn't see properly because a plant was blocked it. She wondered if she should go in or leave it in the closet. When Chan-young opens the door, Hye-ri turns around and calls out immediately. "Hye-ri?" When she turned around, the two looked at each other. Here's what she said, "Uhmm, I'll just return your notes, they might get lost and stolen. Alright." Chan-young said, "Thank you." (Chan-young just smiled at her) "Nothing." Hye-ri said. Chan-young also said to her, "Wait a minute,...(he walks over to her and...suddenly kisses Hye-ri) (10 seconds) let's pretend we have a relationship with each other." (Hye-ri suddenly pulled away) "Huh? Why." She said. "Just...just trust me." Chan-young said. Whether Hye-ri will agree to Chan-young's suggestion. "Oh okay, uhh..I'm single so it's ok, there's nothing wrong with that." Hye-ri said and she agreed. (Hye-ri walks away and just fakes her smile)

When Hye-ri walks away from Chan-young's office, she calls Soo-ho on their plan to use Chan-young to find evidence that he is indeed the suspect in Hye-ri's Mother's murder. (The phone rings and the number is from Hye-ri) Soo-ho says, "Hye-ri, what news?" Hye-ri said, "Soo-ho, challenge accepted. We'll use him." "Good, it's good that you convinced him." Soo-ho said.

Is this the beginning of Hye-ri, Seok-ryu and Soo-ho's revenge against Chan-young? And what does Soo-ho owe to Chan-young why is he interested in the challenge and does he have a family member that Chan-young also kills?