"Seventy-Five Twenty-One," that captures the struggles and harmony of young and old alike. Minseok fails the entrance exam for the Korea National University of Arts and moves to Seoul alone to find a place to live. Ara returns to Korea after filming a violin busking abroad. Chunsim, a building owner who dreams of becoming the best silver YouTuber. Their twists and turns on the notifications are a must-see.
| Actor | Role |
|---|---|
 Shin Jun-seopMinseok | Minseok |