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MC is reincarnator and this is his 100th life. Every time he reincarnates to different place, different world, different time so he has been collectively gathering various knowledge from different worlds and cultures. Currently a baby prince (from emperor and maid) - so royal without political power which is sweet spot cause no need to fear of ruling country but enjoying royalty perks. Tho currently he's living on poorer side and has to be prepared for assassination attempts.
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A bit on boring side, but should give some time, maybe it will get better.
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How a Former Pro takes advantage by doing an easy job