It was done by Swallow

"Meet the three adults." When Rana Su saw the three people, her heart trembled slightly. Three demon slayers of the extermination level have arrived! Sanghai is also among them. There was no expression on his face, as calm as a still pond. It was as if there was no personal relationship between him and Iwao Lin. You know, for a strange incident of this magnitude, even if it involves forbidden things, it is impossible for three extermination-level demon slayers to intervene. At most, there would be...