Bohyung's older brother suddenly passed away on Feb 23 from heart failure.
Upon hearing the news, Bohyung was said to have sobbed uncontrollably for most of the night.
She went to the wake as soon as possible.
"Because the news was so sudden, [Bohyung] was in a lot of pain. It was painful to watch from the sidelines," a source close to the idol shared.
Despite losing her brother, Bohyung made an appearance on the latest episode of "Inkigayo" for SPICA's performance of "You Don't Love Me".
"Being on stage is a promise I made to my fans. It's what my brother would have wanted," the singer said.