In the first episode of Princess Zhu Huan, which episode did the swallow first slip out of the palace?

In the eighth episode of the first part, Wei Zi returned the painting to Little Swallow, indicating that she was ready to give up her plan to recognize relatives. The swallow was afraid and didn't want to take away everything Wei Zi deserved, so she immediately asked to make it clear to Wei Zi face to face. Yongqi and ertai can't beat the swallow. They plan to lie in bed in the middle of the night pretending to be a swallow, and then Yongqi takes the swallow converted into a little eunuch out of the palace.