What book had you the most emotionally invested in the characters?

The best feeling is reading a book that gets you extremely invested in the characters. I have recently gotten into thrillers and read 4 of them in a row which is probably why I am missing that feeling of deep connection with characters. After that I decided to try fantasy for the first time by starting out with the extremely popular ACOTAR series. The sheer passion of this series’ fan base had me feeling certain I would get that feeling with these books, but I am halfway through the 3rd book and while I do find them plenty entertaining, I just don’t feel that connection that I’m looking for with any of the characters. It has me a little worried that maybe it’s just me and I’m not capable of wholly escaping reality in a book anymore… so any suggestions that practically ruined your life because of your emotional investment in the characters would be great!!!