The flashback to ten years ago when Si Yuchuan saved her from a zombie horde? That made the current betrayal even more painful. The irony that the same man who once rescued her is now the one who abandons her to the same fate. And that line "Those words still echoed in her ears, but in the end, she was the only one who believed them" – ouch. That's the kind of hurt that stays with you.
The arrival of Li Shi’s maid claiming Hong Yun is ill was such a classic drama move. I was waiting for Yinzhen to go running off to his favorite concubine, but he actually refused. That surprised me in a good way. It shows that Sifu’s new influence is already working, or maybe he’s just tired of Li Shi’s tricks. Either way, it was satisfying to see her sent away with a scolding.