Overview
- The network released character teasers on July 27 and a poster on July 28 that center Song Kang and Lee Jun‑young as two troubled teenage pianists at an arts high school.
- tvN confirmed the series will premiere on August 29 at 9:10 p.m. KST and slot it in the weekend schedule after Spooky in Love.
- Promotional materials describe Song Kang's character as a competition‑trained prodigy under intense family expectations and Lee Jun‑young's character as a passionate player coping with personal loss and financial pressure.
- The series credits director Park Hyun‑seok and writer Shin Yi‑won, which the network and coverage say frames expectations for the show's tone and production values.
- The title refers to the piano technique where two players share one instrument and the promos use that 'four hands' image as a metaphor for the characters' interdependence and rivalrous growth.