juan

Will follow this post for spoilers, too!

I got this on a spoiler forums so I'm gonna just copy and paste:
Charity Event 1:
A private charity party by Jecheon Group attracts media attention. Reporters who didn't receive invitations try to get the guest list and take pictures from a distance. The party is for Han Seori's grand debut and the start of a major project. Security is tight, and MC enters the hall, where many famous figures greet Cha Yeryun. Eunwoo, who shines just like Cha Yeryun, approaches her, causing a commotion. Despite the party's concept of frugality, Park Eunwoo stands out with his stunning looks. The leads exchange compliments and have a small talk, but Cha Yeryun feels uneasy about Park Eunwoo's mysterious behavior regarding Cha Yebin’s organ transplant and is thinking about the right timing to ask him about his side of the story.

Oh Seon-hye enters the party. Observing her at a party, MC notices she's acting differently, more passive and aloof.

When Han Seori arrives, she stands out in her overtly branded outfit, which contrasts the non-fancy style of the charity party. MC’s father and Cha Yebin look tense because no one has informed Han Seori about the party's concept. Park Eunwoo can’t stop laughing and saying that they have found a wonderful teacher for the heroine.

Her outfit has already become a topic of gossip and ridicule among the guests, potentially damaging the Jecheon Group's image. MC tries to approach Han Seori, but some daughters of smaller companies who got acquainted with Han Seori through Choi Gyeong-ah surround the heroine, praising her outfit.

When MC intends to go talk to the heroine, Oh Seon-hye grabs Cha Yeryun’s hand and pulls her aside, glancing at Han Seori. She says she’s met her at a department store and that she had a plan and doesn’t want Cha Yeryun to be thought of as a mastermind, so she’ll keep her away for now. She says she can’t let the Jecheon Group’s image be damaged, so someone will spill champagne on the heroine and she’ll have to change her clothes into something more modest prepared by Oh Seon-hye beforehand. Then someone really spilled champagne on the heroine. Oh Seon-hye was proud of her actions.

Cha Yebin approached Han Seori and covered her with his suit jacket, taking her out of the party.

Oh Seon-hye and Park Eunwoo met for the first time in front of Cha Yeryun and had a tense interaction vying for her attention. Yeryun felt caught between the two of them and wanted to leave, but they both insisted that she stay. She is overwhelmed by their attempts to charm her. Sparks fly between the two as they try to win her over. Park Eunwoo says that MC’s father was looking for her, so she eventually leaves the two and runs towards her father.

MC asks her father formally if he was looking for her. Chairman Cha expresses his disappointment that she speaks to him formally, as he prefers to be called affectionately. He then reveals how disappointed he is in Han Seori's recent behavior, but they agree to discuss it at home.

Park Eunwoo then appears and greets Chairman Cha, much to MC’s surprise because if her father was looking for her they would have talked already. She realizes that Park Eunwoo has defeated Oh Seon-hye by lying and letting MC leave looking for her father, and she is amazed by his ability.

Chairman Cha has been eyeing Park Eunwoo as a son-in-law for a long time, so when ML addresses him as “father-in-law” MC’s father is happy.

In the original story after Han Seori appears and original Cha Yeryun does a lot of stupid bullying to the heroine, Cha Se-hoon (the father) breaks off Cha Yeryun’s and Park Eunwoo’s engagement to protect both daughters and promotes a new engagement with Seori.

MC realizes that the breakup of Cha Yeryun and Park's engagement, an important incident in the original story, has disappeared. She happily jumps into Park Eunwoo’s embrace repeating “It was a success!” making everyone realize their engagement is not only political. Cha Se-hoon makes a toast to solidify the engagement, while MC is still trying to get out of ML’s arms.

Charity event 2:
Han Seori returns to a party with a new, simpler style provided by Oh Seon-hye. Chairman Cha is unhappy that Cha Yebin is still following Han Seori like a tragic lover. Cha Yeryun is whispering to him that it won’t be easy, because they are actually not biological siblings. Chairman Cha is shocked that MC knows the secret, but still says that they are siblings and that’s how it should be.

Che Yeryun approaches Han Seori who never hides that she hates Cha Yeryun. She asks whether Han Seori knows what this party is about. Han Seori proudly says that Choi Gyeong-ah has told her it’s a party for her and she’ll have to come to stage and say thanks to everyone here.

Cha Yeryun says that there’s also a gift for her, which is the upcoming announcement that Han Seori will be in charge of the new health food brand. All minions gathered around Han Seori who’ve heard that got excited and started congratulating her and Choi Gyeong-ah felt extremely jealous.

Cha Yerin says that it’s all thanks to Cha Yebin that Han Seori got this place and that now many people won’t be able to look down on her. Cha Yeryun gives Han Seori a script prepared by the Jecheon Group to help her with her speech. Han Seori is skeptical of Cha Yeryun's intentions, but MC is skillfully reminding the heroine of all the mistakes she’s made so far in such a short period of time and how everyone had to clean after her, which makes Han Seori tremble with anger.

Cha Yeryun politely greets Choi Gyeong-ah and says that she’s heard that she’s taking care of their family’s ugly duckling. She also says that she heard that Choi Gyeong-ah is friends with Oh Seon-hye, so she asks to say hi to her in her stead as the relationship between them is not easy after the incident. This leaves Choi Gyeong-ah wondering whether the relationship between the two groups hasn’t been restored properly yet. It was somehow supposed to be a warning or a provocation, but it wasn’t clear how it’s supposed to cause anything.

Cha Yeryun once again tells Han Seori to have more common sense and realise her position, the heroine remains defiant, and Cha Yeryun ignores her and walks away to her father and brother.

Cha Yeryun is now mingling with important figures, causing Han Seori to feel annoyed and inferior.

Girls who were introduced to Han Seori by Choi Gyeong congratulate her new position in the Jecheon Group, but Han Seori is playing humble and shy. All these girls are daughters of mid-low level companies, but they were like Choi Gyeong-ah’s minions. She becomes anxious as she realizes the Jecheon Group might be treating Han Seori as a legitimate family member. Han Seori's confidence grows as the women around her praise and encourage her, while Choi Gyeong-ah feels left behind and threatened. She also wonders if Park Eunwoo knows about her new position and if that's why he's been kind to her. She notices him lovingly gazing at Cha Yeryun, making Choi Gyeong-ah feel despair.

Choi Gyeong-ah takes Han Seori away saying to her that she needs to learn to distinguish between useful and not useful people. She uses this chance to get close to other big shots on the party under pretext of introducing Han Seori to influential people. Han Seori is treated rudely and called an "illegitimate child" by some, but Choi Gyeong-ah ignores it and continues to introduce her. Despite the congratulatory words about her promotion, there is a coldness in the eyes of those who gather around Han Seori. Choi Gyeong-ah is excited to have people's attention and continues to talk about Han Seori's new position.

Charity event 3:
Han Seori feels out of place at a party filled with wealthy conglomerates. People ignore her and focus on Cha Yeryun, her half-sister. When Han Seori tries to speak up, she's met with mocking looks. She becomes angry and realizes that she is older than Cha Yeryun and should have been the one to inherit her father's wealth and get his attention. She approaches Chairman Cha to confront him, causing a scene. The atmosphere becomes tense, and everyone looks at Han Seoriin shock. She asks Chairman Cha who her biological mother is, causing even more tension.

Cha Yeryun slaps Han Seori, causing shock and anger. Chairman Cha remains stiff, and MC worries about his condition. Park Eunwoo is concerned about her reddened palm. Han Seori, surprised, questions Eunwoo's actions, causing MC to feel a cool air surrounding her body. Park Eunwoo only responds to Cha Yeryun, causing Han Seori to call out to him again. She seemed to be in a trance, repeating his name and staring at him intently. Han Seori focuses on Park Eunwoo's arm supporting Cha Yeryun and she quickly shook it off. Everyone else at the party was staring blankly into space, except for Park Eunwoo and MC. Han Seori, who is usually bright and pure, seemed to be possessed by something and kept asking Park Eunwoo to come to her. She became angry when he refused and started to run away with Cha Yeryun.

Ml confronts the book/ordeal:
While running Park Eunwoo explained that they needed to go to a place where there are no people because the eyes of the people there were also the eyes of the Flower of Ordeal which will kinda reset the situation. MC was touched by his calm and confident demeanor, and couldn't help but feel safe and at ease next to him. However she couldn't shake off the feeling of worry and anxiety about Han Seori and Chairman Cha.

Park Eunwoo told her that they now needed to wait in a place where Han Seori could naturally come to her senses when she woke up.

Cha Yeryun realized that he meant the party hall. Together they made their way to a nearby lobby. Han Seori approached them with a creepy "Found you!".

Han Seori still overtaken by the Flower of Ordeal confronts Park Eunwoo and Cha Yeryun. The Flower is angered by their refusal to follow it’s demands. Park Eunwoo remains calm and tells Han Seori (the flower) that he does not love her, which further enrages it and it continues saying that there's no way out and they should follow the setting.

Park Eunwoo confronts the Flower of Ordeal for some time saying that he didn’t do anything, the Flower of Ordeal has ruined the story itself by ruining Han Seori's character and that now there’s no way to turn it back. MC is scared by the confrontation, she’s afraid that Park Eunwoo will get hurt by the Flower of Ordeal, so she starts talking to Han Seori asking her to wake up and asking why she wanted to find her biological mother so much. She provokes her by saying that even then the heroine will never be as good as Cha Yeryun.

Han Seori snaps out of it and finds herself in the hotel lobby instead of the party. She is angry and trembling with hatred towards Cha Yeryun for the slap and the words she said. Then Han Seori starts to have a headache and can't remember what has happened, Park Eunwoo steps in to help, telling her that he brought her there and that she should hold on a little longer.

Park Eunwoo then leaves with Han Seori back to the party hall to kinda manipulate the memories of the people at the party this way. They won't remember that our leads have run away, so when he comes back with Han Seori everyone will think that he has taken her out after the face slap and now has brought her in. Cha Yeryun is relieved to be able to sit down and expresses her frustration out loud.