Dear Hyeri started off interesting, but after several episodes, it became unstable and misaligned. Events were piled up for convenience rather than evolution, so the plot became less logical. Eun Ho's character caught my interest in learning more about that disorder.

Her interaction with her ex, Hyeon O, was a pass. In spite of eight years of being together, Hyeon O was a selfish, toxic individual who dropped Eun Ho very easily. The alter ego/personality of Eun Ho, Hyeri, seemed to counterbalance her trauma. The show tried to beautify her final choice of her ex with soft filters, music, and slow-motion sequences, but it was not convincing. Especially after her illness goes cold turkey at the most convenient time.

It was only after Ju Yeon (2nd male lead) informed Hyeon O of Eun Ho's illness that he realized he was in love with her again...really? In Episode 12, the show appears to make an attempt to make the audience empathize with Hyeon O after he was almost killed by a drunken fool. (Please like him now; he’s not such a selfish guy as the first act portrays.) ….right. Overall, the screenwriter failed to fully develop the events leading up to a decent logical conclusion.

Shin Hyen Sun is a good actress, but she should choose better-developed roles or characters or just select a better story period.