The Optimal Solution to Eventually Becoming the Mastermind is a Manga/Manhwa/Manhua in english language, manga series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

After losing her, and have finally returned to his previous world after completing his preparations, Kaltz vows to take revenge on those who have framed his beloved lifelong master, Altesia.
And now, he has turned 10 years old. Using the knowledge he has gained in the future, Kaltz begins to operate in the dark as the "True Mastermind."

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Contains spoiler:

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