He could not tell her the truth, otherwise she would rather die even though it was against her own will. Since he had chosen to hide it, then he would hide it till the very end. After he had helped her detoxify the poison, he would return to her side and beg for her forgiveness.
At this moment, the most important thing for him was to detoxify the poison, protect Lan'er's life, and then kill Bi Ling. He needed to do these things step by step.
Even though he had Wu Ya's spiritual force, he did not know how to detoxify the poison, nor did he know how to drive out the soul, so he could only take it slowly.
Si Mobai felt that it was about time to go to sleep, so he did not dare to stay any longer. He held her face and gently kissed her lips. His hoarse voice was filled with longing but also with determination, "Lan'er, I will still say the same thing. Si Mobai only loves Feng Tianlan. This will not change until death."