Cells live inside Yumi's head, a 32 year-old who works at Daehan Noodles' finance department. In her dull life where her main concerns are what to eat or wear, only one thing excites Yumi and her cell…

Yumi gets to go to the flower festival with Woo Gi, alone! However, Ruby keeps following them and disrupts the date of her dreams before it even begins. The ultimate chase between Yumi and Ruby begins…

Although his first impression was a total bust, Gu Woong turns out to be more decent than Yumi thought. Yumi's heart seemed to be opening up to the easygoing and honest Woong... But why doesn't he rep…

Woong ran in the rain to bring Yumi to the hospital. Finally, the door to Yumi's heart that was shut tightly opens up again... Meanwhile, Woong's female friend Sae-yi starts developing weird feelings …

Sae-yi, the friend that Woong often mentioned, turned out to be a woman! "Can men and women be platonic friends?" The cells break into a heated discussion. On Yumi's birthday, Yumi visits Woong's game…

Having only dreamt of it, Woong finally visits Yumi's house. That night, Yumi and Woong spent an unimaginable night together. At Woong's suggestion, the two of them decide to go on a trip. Yumi's hear…

At a friend's wedding announcement, Yumi mentions that she has a boyfriend. When her friends don't believe her, she proclaims that she will bring Woong to the wedding. But Woong is too busy, she has n…

Rumors about Yumi and Woong's wedding spread like wildfire. However, the two of them have different thoughts about marriage. Meanwhile, someone unexpected appears in front of Yumi as she prepares for …

Yumi finally explodes in anger when Sae-yi moves houses. The breakup alarm gets activated in Yumi's cell village. They risk breaking up if Woong doesn't contact her in 24 hours. While the couple goes …

Yumi's Love cell is good at everything, but she has one weakness. Thus, the cells suggest that Ruby becomes her private tutor to help Love Cell! Meanwhile, Ba-bi who has been paying attention to Yumi'…

As the two of them start living together suddenly, they learn about the sides of each other that they never knew existed. Both Yumi and her cells grow to like Woong even more. If Woong feels the same …

After Yumi brought up the topic of marriage, their relationship grows awkward for some reason. Meanwhile, Woong and Ba-bi attend the same dinner party by coincidence, and drunk Woong forgets everythin…

Woong breaks Yumi's precious table while changing a light bulb for her. Seeing Woong go to extreme lengths to replace her table, Yumi has mixed emotions... On the wedding day of Woong's friend, Yumi d…

Yumi and Woong decide to take a break. Yumi now has to spend time alone when she used to spend it with Woong, so she seeks advice from Ba-bi... After some time, the two of them meet again at the place…