The culprit

Luna clenched her fists so hard they cracked. 

"Luna, you…" Lanni was still speaking when she realized that Luna was no longer beside her. Instead, she was beside Xingyu. 

She grabbed Xiaoshi and pulled her away from Xingyu, glaring at her fiercely. 

"Luna…" Xiaoshi stuttered. 

"I didn't expect this from you, Xiaoshi. How dare you try to seduce my fiancé using such a lowly move, and right under my nose ! Have you no shame?" 

"It's not what you think!" Xiaoshi defended herself. 

"Oh, it's not?" Luna crossed her arms, regarding the other sarcastically. "Sure, I'm supposed to believe that your gown was so long that you tripped on it, and 'accidentally' fell onto my fiancés chest because he simply happened to be there. Yun Xiaoshi, who are you trying to fool?" 

"Luna, you…" The girl shook her head, her mouth wide in disbelief. "I… excuse me." 

She dashed out of the banquet hall. 

The guests immediately fell into chatter.