Su-yeon, burdened by guilt over the death of Hye-gyung, receives a letter from Hye-gyung's twin sister, Ja-yeong. While sorting through Hye-gyung's belongings, Su-yeon discovers that the address in the letter was the home they had planned to share. Confronting Ja-yeong, the two women share their grief and begin to heal, each finding their own way forward as time starts to flow again.
