The artist "혜은이" (Hyeeunyee) that I have information on is a renowned South Korean singer and broadcaster. Born as Kim Seung-ju on September 15, 1954, she is often referred to as "The First Nation's Little Sister." Hyeeunyee rose to fame in the late 1970s with her powerful voice and beauty, sparking the "Hyeeunyee syndrome." Her popular songs include "You Won't Know," "Passion," and "The Third Hangang Bridge." However, the recent releases you mentioned do not match the Hyeeunyee from my knowledge base, suggesting they might pertain to a different artist.
If the recent releases (e.g., "어느 벚꽃이 흐드러진 날에," "Your Nostalgia LIVE part.1") are associated with a different artist named "혜은이" (which might be a name used by another person), I do not have sufficient information about this specific artist.
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