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.

• Kim Go-eun
• Jinyoung
• Ahn Bo-hyun
• Joo Jong-hyuk
• Lee Yu-bi
• Shin Ye-eun
• Pyo Ji-hoon
• Mi Ram