C90 Don't Understand

"Damn it!" Su Qianxun cursed, frustration boiling over. What on earth was happening? No matter what she tried, she couldn't draw out the poison from Su Baihan. It was baffling.

Watching Su Changyi, who was breaking out in cold sweat, Su Qianxun felt like she was suffocating. She couldn't understand what kind of toxin it was, but despite her efforts, she couldn't extract it