I just started a BL series called Truth or Dare. It's set in a world where humans can't lie. The only exception is the main character, who uses his ability to lie to do things like cheat on tests at school to get perfect scores. He's usually extremely careful about not getting caught, but one day the class president catches him cheating and figures out that he can lie. He thinks that he's going to be exposed as someone who can lie, but instead the class president ends up being interested in him, and wants to try to get closer to him. It's pretty interesting so far, so if you're into BL series, I highly recommend trying it out.