I also got into kpop twice (though the first time not into rpf)! It's interesting to see how we can cycle in and out of fandoms, and how they can mean different things to us each time around.

Fake relationships YESSSSS truly one of the best tropes. I too really love hyper-specific work/profession AUs, it feels like taking a peek into someone else's life. Even professions that are supposedly boring I think are very fascinating when examined under the microscope like that.