My black magic is too good, it can be automatically whitewashed.

This is not mine, I found it on fanmtl. All rights reserved by the original author Jun_Cai_Xing_Chi.
Traveling through the magical world of England in the 1930s, everyone else's golden finger is a system, but Dunn's golden finger is his big brother - Voldemort, a real brother-in-law!

"Dunn, this is my newly mastered black magic Fiery Fire Charm!"

"Dunn, this is my new pet basilisk!"

"Dunn, this is my new way to make a Horcrux!"

Dunn, who was instilled with a lot of dark magic knowledge by Voldemort, was helpless. He really didn't want to be an evil Death Eater.

Fortunately, these black magics are too ambitious and can be automatically cleaned up.

"The Fiery Fire Curse is influenced by the justice in your heart, and it is automatically whitened as the Holy Flame Curse!"

"The basilisk is influenced by the justice in your heart, and it is automatically whitened as a feathered snake!"

"The Horcrux is influenced by the justice in your heart, and it is automatically washed into the Eternal Holy Artifact!"

...

"Voldemort was influenced by the justice in your heart, and he was automatically whitewashed as the greatest white wizard of the century!"