Hopefully it's just a troll or tease to the readers with the suspect-looking sunglasses guy and the way this update ended with Isabella leaving.
Hopefully nothing happens to Isabella and it's nothing that'd shift the story for the worse. I also felt that in the last previous 2 updates Isabella has been the 3rd wheel, mainly during the hospital & hotel scenes MC barely interacted with her. She had her moments, but it felt they could've been longer. Personally, i feel MC has a better connection with Isabella than with Alexandra. Well, i might be biased there. Hopefully MC & Izzy (& Alexandra too) have more quality time together
Also, the story is still teasing whether or not there's any fantasy or supernatural elements in the story with the MC's dreams (Izzy's too) & berserker moments.