It was suggested in one of the ch@pters though that the ghost might not be remembering things that happened to him but the memories of the body he possesses when he takes them over. So that could explain why he appears to act like Seoyun in some respects. Plus even before he first possessed Seoyun he acted a lot like Goyo. The eyes though make no sense. Since the ghost had golden eyes from the beginning but neither Seoyun nor Goyo ever had eyes that color as far as we know yet.
Goyo is the twin brother (currently the one with yellow hair). I guess they’re saying the spirit’s personality is more like goyo’s than Seoyun so they’re suspecting that the mc married Goyo in the future. Some ppl prefer Goyo cuz he’s personality is more refreshing? I guess they’re tired of the prim and mr. perfects idk. I like both of them lol

i m pretty sure that the husband is actually Goyo bc the ghost's personality is just like him.