Talk: Derek & Kori's daughter

In Japanese version, this girl call Ethan as sempai so there is no way she is Kori come from the past as she was 16 in her past. Literally mean she is Derek & Koiri's daughter as mention by timeless Derek. And if Derek and Timothy Kairos isn't blood-related then romance between Ethan and Kori's daughter is acceptable, that's my happy ending for Ethan, just my theory though