Kim Yongsun and Moon Byulyi were childhood best friends who did everything together. Yongsun was always the steady presence in Byulyi's life. She was there for her during the good times and the bad, always offering a listening ear, a shoulder to cry on, and protection. But one day, Yongsun vanished, leaving Byulyi feeling abandoned and lost.

At first, Byulyi was angry and hurt that Yongsun didn't tell her where she was going or why she was leaving. But as time went on, she began to understand that Yongsun must've had her reasons... right?