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There are still many of the prince's deceitful practices that need to be exposed. Ruth is playing right into his hands. In the novel it is quite clear that Ruth's principles and goodwill will only cause him grieve.
It is not complete, far from finished. Apparently, the manga artist only uploads 1 chapter from the current volume once a month or every two months. That is quite slow.
Moreover, the artist of part 4 volume 1 is different. One artist is working on part 3 and the other on 4 at the same time. That is indeed confusing. In my opinion It is best to read the novel of part 3 volume 3. Part 3 has a total of 5 volumes.