Acacia summary: Rising star Han Sia wins the Best New Actress award for her debut performance. Amid the celebration, she catches the eye of top actor Jeong Hyeok, who shows clear interest in getting closer to her. Although Sia feels an inexplicable sense of familiarity and longing towards Jeong Hyeok, her newfound success also attracts the envy of actress Sally, who feels threatened by Sia's achievements and Jeong Hyeok's attention. Sally begins to sabotage Sia at every turn, and as her hostility escalates, Sia starts to experience vivid visions of an ancient kingdom. In these visions, she encounters figures who eerily resemble Sally and Jeong Hyeok. As the echoes of a forgotten past rise to the surface, a story unfolds of long-buried memories, unfulfilled revenge, and a love that has endured through the ages.