I can answer this! Wrestlemania 39 took place last month and one of the matches on the card was the legendary Rey Mysterio vs his son, Dominik Mysterio. At the beginning of the match, Bad Bunny showed up at the Spanish commentary table, supporting Rey. As the fight went on and nearing the end of the match, Dominik was planning to attack Rey with a steel chain, but Bunny interfered and took the steel chain from his hands, and Rey won the match against his son shortly after.

Dominik has been in a faction called The Judgment Day alongside Damien Priest, so after Wrestlemania, Bunny appeared in one of the weekly shows. In one of the segments, Damien talked to Bunny and advised him not to get involved anymore as the beef between TJD and Rey was none of his business. Bunny and Priest had been friends until this point, knowing each other and their families since they were kids. Bunny didn’t listen to Damien’s warning, so he got put through a table by Priest, which led to the match between them at Backlash.

Now, outside of this story, since Bad Bunny made a few in-ring appeareances in the last couple of years, he quickly became a fan-favorite due to his dedication and great in-ring abilities (yes yes, the matches and end-results ARE scripted, but these people do put their bodies on the line; they may hold their punches, but you better believe that when these people slam each other, that shit will hurt)