Rena Athalia Lim goes back in time to her 18th birthday, the day her sister's uncertain soon-to-be boyfriend, Ethan Dane, tragically died. As she relives that day, Rena realizes she also died in a previous life on the same day as Ethan. This makes her journey back in time more than just preventing the accident; it's about discovering the strong connection they share. With her memories intact, Rena becomes determined to discover the truth about their shared past lives and the mysteries of the accident. She passionately debates with Ethan, who has undergone a startling transformation since her return to the past. Once kind and gentle, Ethan has become remarkably rude and challenges Rena's beliefs at every opportunity. Marion's attitude also undergoes a transformation. As Rena and Ethan engage in heated discussions, they develop an unspoken connection, their disagreements giving way to a mutual understanding that neither of them fully comprehends. While Rena is determined to unravel the mysteries of their past lives, her quest for answers leads to the discovery of long-buried secrets and deep-seated emotions. The story explores the intricate web of fate, love, and destiny as Rena and Ethan, despite their differences, find themselves drawn to one another without realizing it. "Once Again" is a captivating journey through time, where past lives and present choices collide, leading Rena and her companions on a quest to unearth the truth about their shared history. Will Rena's unwavering determination to discover the past change the course of their destinies, or will the echoes of their history continue to shape their lives in unexpected ways?