When did Ziwei fall off the cliff?

The first part of episode 17 The swallow of Princess Pearl flew away

Wei Zi and Jin Suo went to the apartment and knocked at the door at night. Liu Qing looked at Wei Zi in surprise. Wei Zi said that she had no choice but to come back and asked him not to tell anyone where she was. Liu Hong asked them what had happened. She felt that Erkang had bullied Wei Zi and wanted to settle accounts with him. She was stopped by Wei Zi, and Liu Qing found a very hidden place for them. Erkang looked for Ziwei everywhere and was very sad. Later, he went to the big house to ask Liu Qing, but Liu Qing didn't want to tell him. Erkang said everything, but he still couldn't get an answer. Er Kang asked the children in the mansion, but he couldn't find anything and had to leave. When the swallow heard the news that Wei Zi had left, she was very anxious. Er Kang asked about Wei Zi's hometown. The swallow told him that Wei Zi's hometown had long been deserted and the house had been sold. She knew that Wei Zi had left because of Erkang and blamed Erkang. Swallow hurried to find the imperial concubine, and ran into the painter Ban Helang on the road. Ben looked at her anxiously and asked her why, but all her worries were seen by the painter Lang. After the swallow left, he was warned that he would be sent back to China sooner or later. The swallow got your princess's permission and ran out, but accidentally bumped into the queen. The queen stopped her and asked her why she was in such a hurry. The swallow was very dissatisfied with her, so she spoke ill of herself. The queen asked Husaibao to arrest the swallow and take it back to the palace to teach her a lesson. This one often brings medicine to the queen, which turned out to be the charge of Lafayette before he left. When swallows often pester the queen with too much medicine, she is released. Ben Ming Jie picked up the swallow and hurried away. It turns out that Doctor Chang was moved here by the reinforcements of the class. The swallow returned to the mansion and everyone was so happy to see her. The swallow brought gifts to everyone in the mansion. When everyone was busy choosing gifts, the swallow took Liu Qing and Liu Hong and asked them where Wei Zijin had gone. Finally, Swallow persuaded Liu Qing and Liu Hong to reveal Wei Zi's residence. After many twists and turns, Erkang finally found Wei Zi. When they met, it seemed like a lifetime ago. Wei Zi avoided Erkang and almost fell off a cliff. Erkang climbed up the tree to save her. They know that they have a lot to say together and will not come to them. Erkang told Wei Zi that they had to save themselves and then jump. Er Kang was afraid that Wei Zi, the stone victim below, would protect her and jumped. Wei Zi was unscathed, but suffered many injuries. Wei Zi can no longer hide himself.