Gu Yan promised Su Yunjin that he would not go to Yangcheng again, but he didn't give up on finding a midwife. A midwife still needed to be found. It's just that he promised his young wife, and since Gu Yan wouldn't be leaving, the task of finding a midwife had to be entrusted to someone else. Gu Yan thought it over, and there was no one better suited to this task than his brother-in-law, Wang Meng.
Gu Yan didn't trust anyone else, but he did trust his brother-in-law, Wang Meng. Not to mention that Gu Yan and Wang Meng's friendship was forged through life and death situations, Wang Meng would surely handle his affairs with all due diligence. Considering Su Ningxiu's relationship as well, Wang Meng would not neglect this matter. Of course, fearing that his young wife would not agree, Gu Yan had no intention of telling her about this arrangement.
