I'm assuming Director Li is the one taking pictures of Chen Meng Yun and Zhang Yi Xiang. He really seems obsessed…
I think she didn't suspect anything 'coz she was alone at school, the other teachers and the students didn't care about her... so, she was open to believe, trust and get closer to him.
at the beginning I was afraid of it. but, as the story goes... it's hard to judge their interaction, only on their feet is possible to understand their relationship.
After being disappointed about the cancellation, I came her and IQIYI to check for this drama. (I quite losing my hope...). It's not only censorship, I've heard the arrest of Jiang Guangtao, a dubbing circle boss, implicates Li Xian.