Law Firm Romance: The Attorney and the Secretary.

Kang Seo-yeon, a law firm secretary, spends a drunken one night with her boss, Attorney Yoon Do-jin, by mistake, but it accidentally turns into a night with Yu-rim in Do-jin's memory. For fear of getting fired, Seo-yeon keeps it a secret, but Do-jin finds himself gradually falling for Seo-yeon for no reason.