Why did Liao Suifang suddenly change her tune in "The Returning Daughter"?

The overall score of the daughter who came back was 2022 /

Liao Suifang suddenly changed her mind because of threats from Li Chengtian. Chen Youxi once told Liao Suifang that it was Li Chengtian who asked them to kidnap Li Wenzhuo and killed Wang Chongjiang. Liao Suifang promised to help them testify against Li Chengtian, but when the police gave Liao Suifang a statement, Liao Suifang suddenly changed her words and said She stayed with Li Chengtian that night and provided Li Chengtian with an alibi. In fact, Liao Suifang had no choice but to change her words. Before Liao Suifang went to the police station to testify, Li Chengtian came to see her. Li Chengtian warned her that if she confessed to him, both of them would be imprisoned, and Li Wenzhuo would become an orphan, so Liao Suifang changed his mind.

Li Chengtian's off-screen voice should be that as long as Liao Suifang doesn't testify, he will tell the truth about Xiaoxiu's murder, so that Liao Suifang can't escape the responsibility. Now that Wang Chongjiang is dead, if both of them go to prison, Li Wenzhuo will become an orphan with no one to take care of. Wang Chongjiang owed so much money, Li Wenzhuo would definitely be bullied outside. In order to protect Li Wenzhuo, Liao Suifang finally changed her words and said that she and Li Chengtian were together all night.