Cyanide

Xia Sha, Xiao Zhan, and Hu Che promised to keep each other 'complaint' as they like to call it, to their little club only. 

"What happens on the beach, remain on the beach," Hu Che reminds for the last time as Guan Xian's figure getting closer to their table.

And so, although Xia Sha wanted to consult Guan Xian about Hu Che, she can't let down her promise to Hu Che. 

When Guan Xian drives Hu Che and Xia Sha home after the confusing dinner, he notices the conflict before Xia Sha's eyes. Perhaps, Xia Sha felt uncomfortable for knowing the truth of Hu Che's broken soul. Or she is anxious because she had to keep it a secret that she started to felt nausea and dizziness at the same time. 

Hu Che was sound asleep at the back seat when Guan Xian pull over after Xia Sha urged him to stop. Xia Sha rushed out of the car and was about to empty her stomach when her stomach stops reacting crazily.