Prince Jia Sen knows very well that the memory loss of Ouyang Zhi, Da Long, and Xiao Long is due to drugs and hypnosis.
Prince Jia Sen now just needs to find a way to knock out Ouyang Zhi, Da Long, and Xiao Long again and hypnotize them once more. They will surely remember previous events, and Ouyang Zhi will realize how capable he is. He won't fear Shangguan Xiu anymore and will certainly help him get the antidote.
What he just instructed his assistant to do is to find an opportunity to knock out Ouyang Zhi, Da Long, and Xiao Long, and then bring them to the laboratory.
...
After leaving Prince Jia Sen's laboratory, Ouyang Zhi felt very downcast.
After all, he had just clearly seen that Prince Jia Sen's condition was serious, and barring any surprises, he might lose this partner.
