Is there a second season of Lingyun Code?

No, according to Lingyun Code official website, as of July 4, 2023, Lingyun Code had no second season. Lingyun Password is an original animated work produced by Shandong Radio and Television Media Group Co., Ltd. and produced by Changchun Star He Yi Animation Co., Ltd., which was played on Tencent video on July 20th.