[There are a lot of cheats, so be careful. Try to rationalize them. CP is probably there, but its presence is low. ]
Bie Tan is transformed into a cannon fodder female supporting character. She spends all her time chasing the male protagonist and looking for trouble for the female protagonist.
Before becoming a Bietan: No, eldest sister, what on earth are you going to do~
After becoming a Bietan: Dog plot, you are going to die.
