Yujin from IVE has recently unveiled the track "Sunny Day" for the soundtrack of the medical drama show 'Resident Playbook'. The song, as implied by its title, carries a bright and uplifting tune that reflects the optimism and resilient nature of youth. Its lyrics promote a positive mindset and symbolize the beginning of an ambitious journey.

This song is now accessible on various major music streaming platforms, and the official music video is set to be launched today at 11 PM (KST).

A related series to the well-loved 'Hospital Playlist', 'Resident Playbook’ features Go Youn Jung, Shin Si Ah, Han Ye Ji, Kang You Seok, and Jung Joon Won. It premiered on tvN on April 12, 2025, and can be streamed on Tving and Netflix in certain regions.