I'm at the most recent chapters... from what I can glean, correct me if I'm wrong, it is revealed that he wanted the fruit for someone (can't remember the name), but it isn't revealed who it is or why. He kidnapped FW brother specifically so he could use his blood (harmlessly) to cure that person. JLY minions know who and why but won't say. This was all in the early couple hundred chapters. Now it's in the late 1300s and haven't seen anything about it since. Currently, FW strength is crazy good and JLY is very obviously in love with her though she doesn't realize it and he kinda does?? Le sigh. Author has been snailing the past few chapters too. I keep hitting refresh for more chappies.
Sorry y'all, my semester is almost over, will be releasing those promised chapter summaries... eventually.