In The Poison Gate of Rebirth, how does Pei Lang help Shen Miao to be reborn?

In The Door of Poisoning and Rebirth, Pei Lang helps Shen Miao to be reborn with his life. Pei Lang was Fu's counselor all his life. Because he loved Shen Miao deeply, he couldn't bear to die like this, so he exchanged his life for Shen Miao's rebirth.

Before her rebirth, Shen Miao was Miss Shen Jiawu and a famous playboy in Beijing. Shen Miao had a crush on the king in her last life. She once gave all her money to the king and helped him accomplish great things, but in the end she was ruined and died. Rebirth, come back to protect the family, fight the enemy, and finally marry Xie Jingxing to become the Queen of Daliang.

Extended data:

Pei Lang in "Rebirth Poison Gate" is also reborn like Shen Miao, and Pei Lang after rebirth also has memories of past lives. After Shen Miao was born again, Pei Lang was just a teacher. She knew that Perrin could give full play to her talents in the future, so she would strike first and get her back. After being recovered, Pei Lang also gave him a hand after learning Shen Miao's mind.

Pei Lang's life has only one purpose, and that is Shen Miao. Love her, protect her and repay her. Before he remembered his past life, he did it even though he didn't know the reason.