Hua Yan instructed An Shiqi and He Shi to wait under the big tree to keep watch; she then led the two men to a quiet and deserted area to disclose Su Zizhan's condition, that his cold disease left him only three months to live and that no one but the Poisonous Insect King could save him, as well as her journey to Nanjiang to seize the Poisonous Insect King.
She didn't hide the truth, since she was seeking their help, she naturally had to be honest about the actual situation.
Especially, she felt that the two men were capable of more than just helping her to pass through territories effortlessly and without delay, without the need for negotiations; perhaps they could also help her engage with Yun Chi in the capital city of Nanjiang on the surface, allowing her not to confront Yun Chi directly, and by shadowing them, she'd have a greater chance of seizing the Poisonous Insect King.