THAMA and JUNNY Turn 'Yumi's Cells 3' Into Pure Romance

When a beloved Korean drama returns after four years, the pressure on its soundtrack is immense. Yumi's Cells Season 3 has felt that weight from its very first episode — and with the release of OST Part 4, singer-songwriters THAMA and JUNNY have proven they were more than ready for the challenge. On April 28, 2026, both tracks dropped simultaneously at 6 PM KST across major music platforms, delivering what fans and critics are already calling the emotional heart of the season.

The decision to release two songs as a double title is itself a statement of intent. Rather than choosing a single defining sound for the drama's fourth OST chapter, the production team leaned into contrast — pairing THAMA's sweeping lyrical ballad with JUNNY's intimate, quietly building pop track. The result is a soundtrack release that captures the full emotional range of falling in love.

THAMA's "Shooting Star (유성)": A Love Letter Written in the Night Sky

THAMA's contribution to the OST, "유성" (Shooting Star), arrives as a lyrical pop ballad that does what the best K-drama songs do — it gives a feeling a name. The central metaphor is both timeless and precise: the overwhelming rush of love compared to a shooting star blazing across the night sky, brief but utterly unforgettable.

The narrative arc of the song is quietly poetic. It tells the story of a lonely, nameless existence — someone who has been wandering without direction — who finally finds identity through love. The moment of connection becomes the defining wish that gives meaning to an otherwise rootless life. By the final chorus, that wish transforms into a promise of eternal devotion, delivered through THAMA's remarkably resonant vocals.

What makes the song stand apart is the way THAMA uses restraint as a tool. The production stays close and intimate in the verses before the track opens up into something larger — mirroring the way love itself starts quietly before becoming all-consuming. The vocal performance never reaches for drama for its own sake; instead, every emotional peak feels earned by what came before it.

For fans of the drama, the song arrives at exactly the right moment. Season 3 finds Yumi (played by Kim Go-eun) as a successful screenwriter whose steady, calm life is disrupted by an unexpected person. The themes of rediscovering desire and identity in "Shooting Star" map precisely onto where Yumi finds herself in the story.

JUNNY's "Into My Life": When Love Comes Back Like Destiny

While THAMA's track looks outward — toward stars and the sky — JUNNY's "Into My Life" turns inward. The song begins with a gentle acoustic guitar line so delicate it feels almost tentative, as though the narrator is still deciding whether to let the feeling in. As the track progresses, synthesizers and drums layer in carefully, following the emotional progression of someone slowly, inevitably surrendering to love.

The core tension of "Into My Life" is its premise: what happens when you fall in love at the exact moment you'd decided to stop believing in it? That specific emotional territory — not fresh-faced romance, but the complicated flutter of something returning when you least wanted it — is one of the harder feelings to capture in song. JUNNY makes it sound effortless.

His vocal delivery is what truly sets the track apart. Known for a tone that balances warmth with precise emotional control, JUNNY uses his voice as a storytelling instrument, emphasizing vulnerability in the verses and releasing it in the chorus. The effect is a song that rewards repeated listens: each time through, a new layer of feeling surfaces.

For viewers following the evolving dynamic between Yumi and her new love interest (played by Kim Jae-won), the song provides an almost uncomfortably accurate emotional mirror. The drama's storytelling has always excelled at externalizing internal emotional states — most famously through its literal portrayal of brain cells as characters — and "Into My Life" functions as that same kind of externalization, putting feeling into sound.

The Artists Behind the Songs

Both THAMA and JUNNY bring significant musical credibility to this collaboration. THAMA, signed to EMA, has built a reputation as a songwriter with a gift for blending lyrical imagery with emotionally resonant melodies. The singer-songwriter's style leans toward the literary — themes of searching, belonging, and the weight of love recur throughout their catalog — making "Shooting Star" a natural fit for a story about identity and connection.

JUNNY (주니), signed to MOVE Company, enters this project on the back of a particularly strong period in his career. His 2025 second full-length album null and the accompanying world tour have raised his international profile substantially, establishing him as one of the more versatile and emotionally intelligent voices in Korean R&B and pop. "Into My Life" marks his first OST of 2026 — and based on initial fan response, it's a strong opening move for the year.

That both artists are singer-songwriters, not just performers, adds another dimension to the double release. When an artist writes or co-writes their own material, the emotional specificity tends to be sharper. Both songs feel inhabited rather than performed, which is exactly what a romantic drama of this scale needs from its soundtrack.

Yumi's Cells Season 3: A Drama Worth the Four-Year Wait

Yumi's Cells first aired in 2021, quickly establishing itself as one of the more inventive romantic dramas in recent Korean television history. Its conceit — portraying the competing emotions in protagonist Yumi's mind as literal cellular characters — gave it a visual and narrative playfulness that set it apart from the crowded K-drama landscape. Season 2 followed in 2022. Then, for four years, fans waited.

Season 3 picks up with Yumi's life transformed. She's now a professional screenwriter, successful by most measures, and her life has achieved a certain settled quality. That equilibrium is disrupted — as it always is in stories worth telling — by the arrival of an unexpected person who forces her to feel things she'd stored away.

Kim Go-eun returns in the title role, delivering the kind of performance that has made her one of the most trusted actresses of her generation. Her resume — which includes Guardian: The Lonely and Great God and The King: Eternal Monarch — demonstrates an ability to make complex emotional terrain look simple, which is precisely the skill the role demands. Opposite her, Kim Jae-won brings a different energy: a presence that is both disarming and specific, suggesting a character with layers still waiting to be revealed.

Behind the camera, director Lee Sang-yeop and writers Song Jae-jeong and Kim Gyeong-ran — the same creative team responsible for the earlier seasons — have returned, which gives Season 3 a continuity of vision that audiences can trust. The drama airs on Tving every Monday at 6 PM KST (two episodes released simultaneously as an exclusive preview), with tvN broadcasting individual episodes every Monday and Tuesday at 8:50 PM KST.

The OST trajectory has already been impressive: an earlier chapter of the soundtrack featured Stray Kids member HAN's "Let It Show," which set a high bar for what the season's music could achieve. Part 4's double title suggests the production is committed to building a soundtrack with real emotional range — and THAMA and JUNNY have made a compelling case that the right artists were chosen for the job.

Both "유성 (Shooting Star)" by THAMA and "Into My Life" by JUNNY are available now on major streaming platforms including Melon, Bugs, Genie, and Spotify. As Yumi's Cells Season 3 continues its run through spring 2026, these songs look set to become the tracks fans return to whenever they need to feel something.