Beatrice killed Vivian and blames Raeliana, many believe in Beatrice because she was Vivian's friend, in addition to the fact that she used the receipt for the crystal bomb that was bought in Vivian's name to say that Raeliana killed her for that, in chapter 134 , Raeliana asked the king to help him set a trap for Beatrice, so the king looks for any loose ends to help her while Justin looks for the evidence and Heika, they managed to get there but Justin didn't find anything because Beatrice burned the evidence, the Beatrice's father left with the receipt of the crystal to continue arguing, but then the paper happened, Heika grabs the paper to verify who the letter of the receipt is to see if it was forged or not, then it was revealed that it was Beatrice was the true owner .
Note: that ability that Heika used isn't really taken out of nowhere for convenience, in chapter 38 you can see that Heika's assistant can do the same in tracking mode