In which episode of the TV series "Searching for Qin", tell him that he came back from modern times?

Brief introduction of diversity stories in Qin Xun Ji Episode 27

Ying Zheng heard that Shao Long was leaving and actively retained him. Shao Long refers to the ambition of Ai, reminding Ying Zheng to be careful of his excessive power. Ying Zheng suggested to the king of Qin that Tingwei should be in charge for three months. Zhu Ji pretended to have nightmares and was afraid that the assassin would pretend to be a bodyguard, which led to the cancellation of the term limit of the general manager by Qin Wang. The King of Qin praised Qin Qing for teaching Ying Zheng well, and Zhu Ji suggested setting up a chastity monument for her. Shao Long heard the fierce opposition, and everyone was frightened. Shao Long advised Qin Qing not to promise to set up a meritorious monument to avoid getting married in the future. Qin Qing conveniently forced him to confess, and pointed out that he also set up a monument for himself in his heart. Shao Long was speechless. Zou Yan borrowed two stars in the sky, the Cowherd and the Weaver Girl, suggesting that Shao Long should not be gloomy emotionally, but dare to love and hate. Shao Long is thoughtful. Shao Long admitted to Qin Qing that he was from the future. Qin Qing angrily accused him of rejecting himself and leaving. Zou Yan listened to Qin Qing's retelling, carefully thought about Shao Long's words and deeds and predictions, and decided to give it a try. When Zhu Ji was having an affair with Lao Ai, the king of Qin suddenly came, and Lao Ai hurriedly hid. The king of Qin suspected that Zhu Ji had no contact with Buwei, and Lao Ai decided to play along. Zhu Ji invited Wei to the bedroom and pretended to need his comfort. At this time, the king of Qin suddenly burst into the door and Wei's face changed greatly. Although he was not afraid to calm down the incident, the king of Qin still had a thorn in his heart and opposed his proposal to build a canal. Buwei is not happy. Zhu Ji will take the opportunity to provoke again to avoid showing evil eyes. It's not, Wei's move to retreat into the future really made the king of Qin feel ashamed, pretended to be grateful and had a drink with him. When Qin Qing and Zou Yan asked the future man Shao Long about astronomical knowledge, they were shocked to learn that the king of Qin was dying.