Tian Qiqi
Ling sheng is clueless about Xiaoqi's dad.. But i m pretty sure it will be Jun shiyun. Given how his Insomnia is cured around her.. It proves that they accidentally slept together... and either he doesnt remember the incident or doesn't know the woman's identity.. yet the lingering memory of tht night must be making him so comfortable around her that she can cure his insomnia now.