Seo In Guk Personally Sings 'See You at Work Tomorrow!' OST — Emotion And Immersion Soar

on July 1, 2026

'See You at Work Tomorrow!': Seo In Guk sings OST 'The One Who Filled Me Up'

서인국, 박지현 [사진: tvN '내일도 출근!'] — Seo In Guk and Park Ji-hyun [Photo: tvN 'See You at Work Tomorrow!']

Seo In Guk, Drama, OST, See You at Work Tomorrow!, Kang Si-woo, Park Ji-hyun, Cha Ji-yun — Seo In Guk [Photo: Studio Dragon·TOON STUDIO]

Singer-actor Seo In Guk has recorded the fourth OST for tvN’s Monday–Tuesday drama See You at Work Tomorrow!, sending fans into a frenzy.

The track titled 'The One Who Filled Me Up' drops at 6 p.m. on July 1 via major online music platforms.

Built on an acoustic folk sound, the song captures sincere gratitude for the person who offered comfort in a weary life. Portraying Kang Si-woo in the drama, Seo In Guk lends his own voice to the OST, with his smooth vocals amplifying the track’s emotion and immersion.

Premiering on June 22, See You at Work Tomorrow! is an office drama that follows seventh-year employee Cha Ji-yun (played by Park Ji-hyun) and her boss, Kang Si-woo, as they become someone special to each other.

The 12-episode series airs every Monday and Tuesday at 8:50 p.m.