How To Know You Have A Favorite Group:
Okay, so first thing is first. Do you have a group you really love a lot? Maybe sometimes you feel like they are overshadowing the others? You must have a bias in a group that loved, right? So think of the group and think of the bias in that group. How high ranked is your bias in that group? On a scale from someone you don't like much at all to your UB. Is that bias ranked super high, super low, or average? If he/she is ranked super low then think why. You love that group but your bias is iffy, why? If he/she is average then not bad but not the best either, again, think to yourself. Why? If he/she is ranked super high then great! They are suitable and good and so is the group.
Now let's say that group is nominated in some big award and you're all for it until, of course, another group that you love oh-so dearly is pinned against them and you must choose one to show support for. Who? Well, if the group that you thought about earlier is flat-out who you will vote for with no questions then, they might just be that favorite group of yours and if not then they might not be. Either way you can't tell for sure unless you are at the point of near Sesang to where you want to murder whoever bashes your Oppa/Noona.
And those would be the basics to how to figure out if you have a favorite Kpop group. The key is pretty much to see how far you will support and love them, even if that means voting for them over the other amazing Kpop groups.
If you have any other way of knowing feel free to comment it in the comments!