This is the true rarity. While English ISOs are common, localization was a monumental task. Microsoft had to integrate complex vowel-consonant clustering (Hangul Jamo) into the GDI (Graphics Device Interface). Early versions of Windows 95 Korean had bugs where typed Hangul would "explode" into individual letters. OSR2.5 represented the mature, stable version of Korean text rendering. It also included specific fonts (Gulim, Batang) and Input Method Editors (IME) necessary for the Korean financial and gaming industry.
: Bundled DirectX 5.0 and updated versions of Outlook Express. The "Korean ISO Repack" Context
Unlike previous versions, OSR 2.5 included the Active Desktop update, which blurred the lines between the local desktop and the web.
: Standard Windows 95 retail discs were not bootable . Repacks often include a bootable floppy image or are "repacked" into a bootable ISO format to simplify installation on modern VMs like VMware or PCem. Installation Requirements Windows 95 OSR2.5 (Korean) : Microsoft - Internet Archive
The OSR2 update, released in 1996, was a major update that included several improvements, such as better hardware support, enhanced security features, and updated system files. OSR2.5, released in 1997, was a subsequent update that built upon the OSR2 foundation, further refining the operating system and adding new features.