Young Eun está trabalhando duro para ganhar um contrato com a marca de um famoso estilista. No entanto, as coisas não estão funcionando como planejado, e agora ela deve ir a um encontro às cegas no lugar de sua amiga Chi Sook. Lá, ela conhece um cara chamado Jae Guk, um fotógrafo. No começo, ela nem se preocupa em mostrar o menor interesse nele porque está preocupada com seu trabalho. Mas ela logo percebe que precisa da ajuda dele.

Falta apenas alguns dias para o evento de 30 anos da The One. Para tornar o evento um sucesso, Young Eun e seus membros de equipe trabalham duro e tentam convidar Hye Rin, uma influenciadora popular, como modelo de suas roupas novas. No entanto, as coisas não estão indo bem, já que Hye Rin está sendo muito exigente e não cooperativa. Falta apenas um dia para o evento, e Young Eun vem tomar uma grande decisão. Enquanto isso, Jae Guk descobre quem comprou sua foto em Paris há dez anos.

Young Eun quer saber sobre o relacionamento entre Jae Guk e Soo Wan. Ela compartilha com Jae Guk suas memórias de como conheceu e terminou com Soo Wan pela primeira vez. Ela logo ouve sobre as notícias de Soo Wan de Jae Guk. Enquanto isso, todos na The One estão chocados com a notícia de que o design principal da nova coleção da Sono foi copiado e já está à venda no mercado.

Young Eun vive em tristeza e remorso depois de descobrir o fato de que Soo Wan morreu a caminho de encontrá-la há dez anos. Além disso, devido ao declínio nas vendas da Sono, Young Eun é transferida para uma equipe que lida com uma nova marca de licenciamento. Chi Hyung, irmão mais novo de Chi Sook, volta dos estudos no exterior e se junta à equipe de Young Eun. Enquanto isso, Chi Sook começa a pensar que Do Hoon tem uma queda pela Young Eun.

Young Eun decide parar de afastar Jae Guk, e ele se torna uma grande ajuda na promoção da nova coleção da Sono. Mi Sook deseja que ela tenha sido diagnosticada incorretamente mais cedo e vai ao médico novamente. Chi Sook, que pensou ter descoberto sobre o segredo de Do Hoon, percebe que está enganada. Enquanto isso, Yoo Jung relembra suas memórias de como tentou separar Soo Wan e Young Eun há dez anos.

Do-hoon starts to act strange when Chi-sook is around him or when she sends text messages to him. Chi-sook wants to know why and decides to ask Do-hoon herself. Mi-sook withdraws all the money from her bank accounts and starts to buy whatever she wants to have just for her and her mother. Meanwhile, Young-eun gets to find out the fact that Soo-wan and Yoo-jung were engaged even when Soo-wan was seeing Young-eun.

Jae-guk receives offers from several global brands, and he decides to work with a Parisian company called DPHP. Meanwhile, Young-eun’s team is shaken up when Hills Department Store calls and says they want to cancel the deal with Sono. As Young-eun tries to make things work out with President Choi of Hills, Mi-sook calls Young-eun with an emergency.

Soo-ho quits working to look after Mi-sook. However, Min-kyung, with whom Soo-ho has secretly been having an affair, comes to Soo-ho and Mi-sook’s place unannounced. Chi-sook also finds out that Mi-sook is ill and starts to persuade Mi-sook to get hospitalized and receive treatment. Unexpectedly, Jae-guk’s mother tells Jae-guk that she wants to cook a meal for Young-eun. Without knowing that she had an ulterior motive, Jae-guk invites Young-eun with joy.

Young-eun’s mother finds out that Soo-wan died ten years ago and that Jae-guk was born out of wedlock. She starts trying to strongly stop Young-eun from seeing Jae-guk. She even barges into Jae-guk’s photo studio and causes a scene. Young-eun waits for Jae-guk’s call, but she doesn’t get any from him. Meanwhile, Chi-sook starts to feel confused with Do-hoon after seeing his new style and hearing something surprising from him.

Young-eun is extremely busy and tired of working with Sono’s new partner company because they keep asking for unreasonable demands and being very fickle-minded. Meanwhile, Chi-sook accidentally hears the secret conversation between Soo-ho and Min-kyung and learns that Soo-ho is cheating on Mi-sook. Feeling upset and betrayed, she goes straight to Mi-sook’s place to share what she found out.

Everyone working for The One hears a rumour that the company might be sold off. Although most of the employees are tormented by the sense of insecurity and anxiety, Young-eun decides to continue to work on the project she’s been working on. She plans to hold an online fashion show and send out invitations to globally influential buyers. She also asks someone who always wanted to be a fashion model to be a model for her show.

Sono gets an offer from Olivier and Nouvelle Vague meets Young-eun saying they want to do an interview. At first Young-eun agrees, but when she sees the questions, she refuses saying that none of the questions are about Sono. Mi-sook prepares to say goodbye by making kimchi with her friends and sharing it with them. Meanwhile, Jae-guk tells Young-eun he’s planning to go to Paris.

After much consideration, Young-eun turns down the offer from Olivier. Instead, President Hwang offers Young-eun to start a separate business with Sono and gives her time to think about it. Meanwhile, Jae-guk starts getting ready to go to Paris and buys two tickets. He then asks Young-eun to come with him.

As Mi-sook’s disease spreads, she prepares to say goodbye to her friends and family. Chi-sook’s misunderstanding against Do-hoon is resolved when she hears from her father that the reason he hired Do-hoon wasn’t her. After contemplating, Young-eun decides to quit Sono and start her own brand.

After Young-eun quits Sono, she starts her own brand, but it’s proving more difficult than she thought. Do-hoon and Chi-sook start to live together and Chi-sook helps Young-eun start her own brand. Jae-guk comes back from Paris for a fashion show in Busan and meets Young-eun.