While the constitution of the young lady on the stage did resemble the Innate Poison Body, no one present there had actually seen the true Innate Poison Body in person, so it was difficult for them to verify the matter on the spot.
Furthermore, for Lin Jianghai to proclaim that he had found the founder shortly after Shen Jue had found the Tome of Poison Legacy… No matter how one looked at it, it appeared that Lin Jianghai was making it up to willfully go against Shen Jue.
