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.

After receiving a bizarre chance to go back in time, a man wakes up to find that his whole life — including the person he married — is different.

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.

Women gather power to revenge on targets, as well as uncover social injustice.