Su Wan had told him that as long as he reminded Su Yiqian who he was, she will listen to him patiently.
As long as she was sitting in the position of the imperial concubine, she will not want anyone to hear anything bad about her much less something which was related to dark magic and soul exchange. If she dared to take the risk, it will not take too long for her to be chased out of the Su family in the capital as well as the imperial palace. They were commoners, they could get away from almost everything as long as they do not murder or attack someone physically.