[A Little Goofy] + [Overpowered] + [No Angst]
Yuan Yao transmigrated into the world of Warhammer 40,000 and served as a commissar for fifty years. Then he transmigrated again.
The good news is that he became a crown prince, and his father died.
The bad news is that his emperor father is Yuan Shu.
Still, Yuan Yao isn't too despairing, because he discovers that his System's golden finger can exchange military merits for the Astra Militarum!
Just as he is imagining using the Astra Militarum to sweep all before him and enjoy being the strongest man of the second century AD, the God-Emperor sends him a message: The Chaos Gods of the Warp have invaded the late Han Three Kingdoms!
(I can't even tell whether this is Warhammer fanfiction or Three Kingdoms fanfiction...)