When was Wei Zi in Princess Zhu Huan II said to be a fake?

In the 28th episode, the uncle and aunt that the queen called and Li who delivered the baby questioned the date of birth in front of the empress dowager and others, and everyone had great doubts about her life experience. In particular, Gan Long hated Wei Zi and Swallow one after another. In a rage, Gan Long immediately beheaded Swallow and Wei Zi, and Erkang was also implicated and sentenced to 15 years in prison. Jinsuo was sentenced to exile and sent to Mongolia.