Moon Geun Young left her fans and followers in awe with a heartwarming tribute to her late elder sister on Instagram.

The December 11 post, which consisted of a photo of the pair, accompanied by an emotional message that expressed her deep sorrow and regrets.

In the caption, Moon wrote: "I guess I still haven't been able to let you go, unnie," Moon wrote in the caption. "There's so much I couldn't do for you, and I have so many regrets and lingering feelings."

She followed up in a heartfelt message that read, '"I wish I could see you. I miss you. I'm really sorry. I'm so sorry." Moon ended her emotional tribute with "have fun with grandma" and to "stay strong for her" in her absence.

"Until then, I'll work even harder to live up to your share too. I love you so much. Thank you. I love you. And I really, really miss you," she added.

The exact date and cause of Moon's sister's death was not revealed, but fans echoed their heartfelt condolences and offered Moon their condolences on Twitter.

Moon Geun Young, a popular drama and movie actress for years, has gone through a lot in the past few years.

Acute compartment syndrome, a potentially life-threatening condition characterized by severe pain and often nerve damage, led to her diagnosis in 2017.

She previously underwent numerous surgeries and recently provided fans with a recovery update, stating she is now fully healed.