Sounding Stream
This came to my mind after reading first half of the chapter 1) lily actually carry the memories of the super empress previous life from the previous era She just somehow manage to hide it extremely well 2) lily recognize Shi Yu as the one who wanted to cook them for lunch, but Shi Yu instead keep them as his pet rabbit 3) the fight between Shi Yu and Super Empress is the trigger to make both of them to remember the past The 3rd point, there are multiple ways to make a person who got amnesia to regain back their memory