This property defines the Unicodes which are line break opportunity when preceded by a leading Hangul character and followed by a trailing Hangul character
Characters like 가,개,갸, etc. are listed under Hangul Leading Vowel Syllable Line Break.
399 Characters are present in Hangul Leading Vowel Syllable Line Break starting with the Unicode point U+AC00 that represents the character 가.
Currently, as per latest version 15.0.0, Unicode supports 43 number of Line Break. Here are a few examples - Alphabetic,Alphabetic or Ideograph,Break After, etc.