The Dark Mage Becomes a Tycoon

'''Introduction to the Work: I thought it was all my fault and that I had bad luck. But the truth was different from what I believed. Without my knowledge, a so-called friend was tripping me up, and my wife had a knife in my back. But now, things will change. Thirty years of being betrayed and toyed with. I have returned with all those memories. I will repay you in kind. The story of Seo Tae-joo, living in the 1990s after his return.'''