Yu Ka Chung travels back in time to save Co Ying, and they discover the condition that triggers one's ability to time travel and what it takes to change destiny. Knowing that Yuet is going to try to change the past, they have to find him before it is too late. In another space-time, Yu Ka Chung tells Yeesa about the dreams that he just had, and that is when Ba Sai Gwai and the others start to put together the connection between both space-time. (Source: Viu)