SYNOPSIS

Yumi is a 32-year-old office worker in the accounting department who has been dating Woong, an IT developer, for the past year. Somewhere inside her mind exists a village of cells responsible for her thoughts, emotions, and decisions. They constantly observe Yumi and guide her toward what they believe are the best choices. The highest-ranking Prime Cell is Love Cell. After Yumi's devastating breakup three years earlier nearly destroyed the Cell Village in a catastrophic flood, Love Cell became convinced that preserving Yumi's relationship is the surest way to protect her happiness.

One day, a mysterious cell wearing white with a name tag reading "109" wanders into the Cell Village. The other cells immediately recognize him as a trainee and drive him away. With the help of Detective Cell and Anxiety Cell, however, he secretly slips into a party hosted by Love Cell. As the cells enjoy a game-show-style ranking of Yumi's and Woong's priorities, an unfamiliar name—Say—suddenly appears in Woong's mind. Cell 109 suggests that they find out who she is, and before long Yumi heads to Woong's office herself.

Say is Woong's longtime friend of ten years and works at the same company. She enjoys driving a wedge between Woong and every woman he dates. She openly wraps an arm around Woong's shoulder in front of Yumi to provoke her, while Woong knowingly watches without intervening and even seems to enjoy the situation. Deeply hurt, Yumi is unable to confront him. At that very moment, Say diverts Woong's attention by informing him of a critical app malfunction, leaving him completely absorbed in work while Yumi's disappointment grows even deeper.

As Cell 109's ideas gain influence among the other cells, Love Cell begins to see him as a threat and banishes him into the darkness. Wandering through the forgotten corners of the Cell Village, Cell 109 discovers Fear Cell and Writer Cell, who has been imprisoned by Yumi's long-abandoned dream of becoming a writer. The moment Writer Cell finds the courage to step forward, Yumi accepts an offer to transfer to the public relations department. Her writing receives praise, and she gradually begins to regain her confidence. Meanwhile, her relationship with Woong continues to deteriorate because of Say's manipulation and Woong's passive indifference.

When the cells gather once again, Love Cell gives Cell 109 three days to win back Woong's love. With the help of Flirty Cell, Cell 109 manages to bring Yumi to Woong, and the two finally begin to reconnect. Just as the atmosphere begins to warm, however, Say deliberately appears and ruins the moment, leaving Yumi no choice but to walk away.

Love Cell places Cell 109 on trial before Judge Cell, has him imprisoned, and sends Clingy Cell to persuade Yumi to apologize to Woong. But Say always remains one step ahead, while Woong continues to avoid taking responsibility. Eventually, a breakup countdown begins inside the Cell Village, and the cells once again tremble as they remember the devastating flood from three years earlier.

As Woong stops responding to Yumi altogether, the final deadline arrives and another massive flood engulfs the Cell Village. Love Cell is swept away by the raging water once again, but this time Cell 109 reaches out and saves her.

Drawn by an unseen force, Yumi enters the Cell Village herself. She sincerely thanks every cell that has protected and guided her throughout her life. To Cell 109, who has quietly remained by her side all along, she finally gives a special name: Self-Esteem Cell. The number "109" subtly foreshadows Yumi's birthday, January 9. At last, Yumi is ready to say goodbye to Woong—not as someone's girlfriend, but as the owner of her own life.

Epilogue. A video call arrives from Babi Yoo, Yumi's colleague in the public relations department, inviting her to dinner on her birthday.


REVIEW

This was the second public performance of the musical following its world premiere, and all photography was prohibited during the show.

The moment the curtain rose, it felt as if the webtoon had stepped directly onto the stage. The vibrant primary colors and the blue-toned costumes worn by the Cells immediately established the visual identity of the production. A lively ensemble number with energetic choreography opened the show, incorporating elements of modern K-pop dance that perfectly matched the comic-book atmosphere. The only minor disappointment was the sound balance during the opening number.

The production maintains its comic-book aesthetic throughout. Love Cell descends from above, cloud-shaped lighting effects fill the stage, and nearly every visual element embraces the whimsical imagination of the original webtoon. The combination of a transparent front scrim and a large LED screen at the back proved especially effective. Scenes depicting the massive flood and clouds of flower petals created impressive depth and transformed the webtoon's exaggerated visual language into convincing theatrical images. By contrast, the powerful lighting aimed directly at the audience felt somewhat excessive. While it may have expanded the actors' sense of space on stage, its effect was less convincing from the audience's perspective.

The live band performed behind the rear scrim, occasionally becoming visible through the lighting. The five-piece ensemble consisted of digital drums, guitar, bass, cello, and keyboard. During the curtain call, the musicians were brought forward on a moving platform. Since the audience had already caught glimpses of them during the performance, I was not entirely convinced that this additional reveal was necessary.

Musically, the score explores a wide range of styles, including lyrical ballads, party numbers, tap dance sequences, and comic songs. The variety keeps the performance lively, but relatively few melodies linger in the memory after the curtain falls. Love Cell's songs demand impressive belting, yet the melodies themselves are fairly conventional. In contrast, the ballads performed by Yumi and Cell 109 were comfortable to listen to and conveyed their emotional journey effectively.

Yumi is portrayed as an ordinary office worker struggling between her secure accounting job and a new opportunity in public relations. She believes she is confident in love, only to find herself repeatedly hurt by Woong's emotional indifference. Surprisingly, Woong became the character that frustrated me the most. I can watch theatrical villains such as the Phantom or Jafar with a certain emotional distance because they belong to the world of fiction. Woong, however, represents the kind of inconsiderate boyfriend who could easily exist in real life. He is fully aware of Say's behavior, yet chooses not to stop it, passively watches events unfold, and at times even seems to enjoy the tension. There were moments when I had to remind myself not to become too emotionally invested. Say, on the other hand, is so openly manipulative that I found myself focusing less on the character and more on the performer's singing and stage presence.

The cast delivered consistently solid performances. Jung Taekwoon brought genuine sincerity and innocence to Cell 109, and his vocal delivery felt noticeably more relaxed and natural than in earlier performances I have seen. Yuria successfully captured Love Cell's bright personality while handling the demanding vocal writing with confidence. Yuk Hyunwook provided excellent comic timing as Detective Cell, displaying the same strengths he demonstrated as Thénardier in Les Misérables.

At its heart, this is a story about love. Yet what ultimately remains is not romance, but self-esteem. Cell 109 begins as nothing more than a trainee who does not even know his own purpose, but quietly influences Yumi's most important decisions throughout the musical. The decision to conceal his true identity until the very end becomes the production's most effective dramatic device, creating an emotional payoff unique to the stage adaptation.

The ending, however, leans somewhat toward sentimentality. After the dramatic climax, Yumi spends an extended period thanking each Cell individually. While the scene clearly communicates the musical's message, it continues after the audience has already understood Yumi's emotional growth. A more restrained, symbolic theatrical approach might have left an even stronger impression and reinforced the theme of self-esteem with greater subtlety.

Yumi's Cells tells a familiar love story through remarkably original theatrical imagination. We all consume countless romance novels, television dramas, and films, often thinking, "I would never make that mistake." Yet when we find ourselves in the middle of our own relationships, those lessons quickly disappear amid emotional turmoil. Real relationships are far more complicated and frustrating than fictional ones, and genuine growth comes only through making our own choices and living with their consequences. Rather than offering easy answers, this musical follows Yumi as she learns to navigate heartbreak and gradually reclaim ownership of her own life, all within the imaginative world of the Cell Village.

The curtain call revealed something equally memorable. It was easy to sense both the nervousness and relief of a company presenting a brand-new original musical to the public for only the second time. The performers seemed fully aware that the production would continue to evolve, and that vulnerability gave the final bows an unexpected sincerity. Regardless of my criticisms, I found myself wanting to applaud not only the performance itself but also the actors and creative team for taking the first steps of what I hope will become a long journey.

The epilogue ends with a video call from Babi Yoo, Yumi's colleague in the public relations department. The moment GOT7's Jinyoung—who played Babi in the television adaptation—appeared on screen, the audience immediately responded with laughter and applause. For fans of both the webtoon and the drama, it was an enjoyable piece of fan service hinting at the next chapter. At the same time, I found it slightly ironic that Yumi's journey toward rediscovering her self-esteem was immediately followed by the introduction of another man. Of course, readers of the original webtoon know that this is simply the beginning of another complicated chapter rather than a perfect happy ending. After all, recovering one's self-esteem does not suddenly simplify life. People continue to fall in love, make mistakes, get hurt, and grow. In that sense, the ending feels less like a neatly wrapped fairy tale and more like life itself.