1. Role of “Choi Hyun”
From DKME’s company profile, there is a Su Hyeon Choi listed as a Non-Executive Director, alongside other executives like E. Michael Ussery and Chairman Seung Ryun Baek. This seems most likely to be the "Choi -hyun" mentioned in the lawsuit, though Korean naming conventions can vary slightly in Romanization—so the overlap of last name and board position makes it a very probable match.
So it's reasonable to conclude that:
The person sued alongside KIB Plug Energy was a current board member, likely playing a direct role in DKME’s leadership or governance structure.