Guys hear me out, the author might be cooking some proper plot twist that hopefully would make all this wait and glaze worth it. The girl in taehas bad dream looked totally like nahaesoo, and then we had that line from his brother saying "does he even know who she is" or something like that (i hope im not blind or just read wrong). So maybe shes someone from the long past actually making impact on taehas life long before, so maybe in the end just everything will clash together in a tasty and worthy drama and big plot twist.
[Im hoping for the best here]