TV series
What is Yu-mi thinking now?
Yumi is a 30-year old, ordinary woman who struggles with expressing her feelings. Told from the perspective of the many brain cells in her head, she experiences growth in both her love life, her career, and finds happiness in the small joys of everyday life.
Streaming, rental and purchase options
Checked Jul 22, 2026
Yumi's Cells is available to stream on Rakuten Viki in United States. Use the direct links below to open the provider.
Yumi is a 30-year old, ordinary woman who struggles with expressing her feelings. Told from the perspective of the many brain cells in her head, she experiences growth in both her love life, her career, and finds happiness in the small joys of everyday life.
Choose an episode, then use the watch options above for the show.
Episode 1
After breaking up with Woong, Yumi and her cells are struggling to keep her life together. Although she acts as if nothing happened, Yu-mi is suffering from post-breakup syndrome and Ba-bi comforts her. In no time, a Yoo Ba-bi club has formed in the cell village without Yu-mi realizing...
Where to watch Yumi's Cells
Episode 2
Although Yu-mi was taken aback by Ba-bi's sudden confession, her confidence level shoots up. Yu-mi becomes more preoccupied by Ba-bi and she unconsciously finds herself getting heated up when Ruby sets up a date for Ba-bi.
Guest stars Kim Mi-su
Episode 3
News of Ba-bi's date puts Yu-mi in despair. Yu-mi wishes he doesn't go on the date. But she couldn't tell him in the end... On the day of Ba-bi's date, Yu-mi falls asleep after feeling perturbed the entire day, when a message from Ba-bi arrives.
Guest stars Kim Mi-su
Episode 4
Yu-mi's sweet romance with Ba-bi begins... Her new romance leads her onto a new path. When Yu-mi goes to a book cafe with Ba-bi, she is reminded of her long-lost dream. Although she knows it's too late, someone keeps encouraging Yu-mi to pursue her dream.
Where to watch Yumi's Cells
Episode 5
Yu-mi and Woong meet again during second-hand market meet up. Unlike Woong who thought it was a fateful meeting, Yu-mi is confused by what Woong said in the past as compared to his current situation. While Yu-mi is trying to enjoy her Christmas with Ba-bi, a message from Woong arrives.
Guest stars Park Ji-hyun
Episode 6
Yu-mi works hard from day-to-day as an aspiring writer. Ba-bi visits her house to cheer her on. While the two of them are enjoying their date, an unexpected visit from Yu-mi's parents catches them by surprise... Yu-mi's father begins to openly keep Ba-bi in check.
Guest stars Park Jin-joo, Jeon No-min
Episode 7
Unlike her courageous start, Yu-mi continues to taste failure from all her contests. Despite Writer Cell's efforts to keep her mind together by recalling wise sayings, Yu-mi feels dejected at her own lack of talent... At that moment, she receives an offer from Mr. Nam to reinstate her position at Daehan Noodles.
Where to watch Yumi's Cells
Episode 8
Da-eun, an intern at Daehan Noodles' Jeju branch, likes Ba-bi but she decides to give up when she realizes Ba-bi has Yu-mi. Meanwhile, the chief editor at Julie Literature, Ahn Dae-yong, finds out that Yumi, the writer he picked, is his first love from his college days and believes that this is fate...
Where to watch Yumi's Cells
Episode 9
Yu-mi starts working with the oddball illustrator Control Z. Although she's on the verge of exploding when Control Z nitpicks at everything, she controls herself to stay professional. When Yu-mi flies to Jeju to spend the new year with Ba-bi, she finds out that Ba-bi is giving up his lease.
Where to watch Yumi's Cells
Episode 10
After the breakup with Ba-bi, Yu-mi's writing improves greatly thanks to Writer Cell who has become the Prime cell. Now a successful entrepreneur, Woong is surprised to find that Yu-mi is now a writer. When he meets Control Z through a business meeting and learns that he is the illustrator for Yu-mi's works, his heart pounds restlessly...
Where to watch Yumi's Cells
Episode 11
When Yu-mi hears that Ba-bi has returned to Seoul, she notes down the places that Ba-bi frequently visits to avoid him but ends up running into him at his go-to cafe. Having thought over countless times what he would say to Yu-mi if he meets her again, Ba-bi holds her back...
Where to watch Yumi's Cells
Episode 12
As the war of nerves between Woong and Ba-bi rages on, Yu-mi is put in a tight spot by the unexpected three-way encounter... Meanwhile, Yu-mi finds out that Ba-bi is going to America for a business trip while planning for his birthday. With everything happening at bad timing, will getting back together with her ex be that hard?
Where to watch Yumi's Cells
Episode 13
After being proposed to by Ba-bi, Yu-mi goes to meet Ba-bi's father. Yu-mi tries her best to make a good impression on Ba-bi's father, going as far as to summon her full-of-manners self. Meanwhile, Woong hears of Yu-mi's wedding and asks to meet her...
Guest stars Jeon Soo-yeon
Episode 14
On the day of the wedding, Yu-mi is unable to meet the deadline. She falls into a panic when she loses her laptop containing the manuscript. At the wedding, all she can think of is running away from reality... At that moment, someone contacts Yu-mi and says that he found her laptop. Who could it be?
Where to watch Yumi's CellsEpisode information updated Jul 23, 2026
Kim Go-eunKim Yu-mi
Ahn Bo-hyunKu Woong
Kim Jae-wonShin Soon-rok
JinyoungYoo Ba-bi
Jun Seok-hoAhn Dae-yong
Park Ji-hyunSeo Sae-yi
Lee Yu-biLee Ruby
Mi RamKang Yi-da
tvNSouth Korea
TVINGSouth Korea
Studio DragonSouth Korea
MerrycowSouth Korea
Studio NSouth KoreaTVINGSouth Korea
