I saw the reviews about the fresh twist on transmigration but it wasn't as interesting as I thought it would be. The MC is a transmigrator with a System that was dropped accidentally into when ML was in high school. She spends half a year with ML and eventually tells him about it (I guess no penalty it's to him knowing) before she leaves. Inadvertently she changes the plot so that he's essentially the ML (the og protagonist even confesses to him). Meanwhile ML waits for MC to transmigrate back - she does and that's where this story starts. For some unexplained reason, she has no system and no memories of her previous transmigration.

Turned out ML just waiting for her. They already met years ago... but system got problems due to plot diversion, so she forecasted to reappear after 5 years (but it became 8yrs).

ML still followed OG plot based on FL's instructions (he acted inlove with OG FL but rejected her when she confessed) while awaiting for FL's return until she came back while they're filming variety show (with no memories).