After a painful breakup, office worker Yumi’s "love cells" fall into a coma, leaving her daily life dull and romance-free. Her outlook changes when she meets Gu Woong, an emotionally stunted game developer who sparks an unexpected connection. As they navigate their budding feelings, Yumi's cells work to reignite her heart and help her find love again.

After a chance meeting with game designer Goo Woong helped revive her "love cells," Yumi enters a new chapter of growth following their eventual breakup. When an unexpected source of inspiration from her co-worker, Bobby Yoo, reignites her ambition, Yumi sets out to pursue her long-held professional dreams. As she navigates fresh personal and career challenges, Yumi strives to find true fulfillment in both her life and her heart.

Now a successful web novelist, Yumi has achieved her professional dreams but finds her "cells" have grown dormant, leaving her feeling indifferent. Her quiet life is disrupted by her new editor, Shin Soon-rok, whose rational nature unexpectedly reawakens her emotions. As Yumi navigates her connection with Soon-rok, she is also pursued by a charming fellow writer, forcing her to decide which path will lead to the fulfillment she seeks.