I've Fallen for You Episode 21

Zhao Cuo's dad resigns because of neglecting to protect He Zhen. Bai Yi Fei and Zhao Cuo reminisce about the past and say their goodbyes, but end up fighting. Bai Yi Fei and He Ruo Yao go to the capital ahead of the rest. Tian San Qi leaves with He Zhen and Zhao Cuo gives her a final gift from his mom. In the capital Tian San Qi hears the song that her true love knows. She sees a locked door and goes inside to investigate. Zhao Cuo's family is attacked as they leave and it turns out his dad already knew there would be an ambush. We also learn about Zhao Cuo's past. (Source: jindreame at MyDramaList)