Back to 84: the Magic Pupil Rushed to the Sea, and the Fish Caught Shocked the Sister-In-Law

I was reborn in 1984, my family was destitute, my brother had just died, and I was a bad gambler that everyone despised. Outside the door, the village bully was talking dirty words to the newly widowed pretty sister-in-law, forcing her to use her body to pay off the debt! In my last life, because of my cowardice, I watched my sister-in-law get injured and commit suicide. She eventually died of illness on the street out of regret. In this life, the divine pupil has awakened, and I swear to the sky: Anyone who deceives me will sink to the bottom of the sea! Anyone who insults my sister-in-law will have their bones broken into pieces and ashes thrown away! The whole village laughed at me for saying that I could pay off my huge debt in three days. I just used money to swell the bully's face! Are the county predators teaming up to block me? I opened a seafood restaurant with my backhand, and used future recipes to make him kneel down and beg me for supply! International giants want to play monopoly? I sold a boat of bluefin tuna for a sky-high price and bought his fleet on the spot, which shocked the world! Others rely on the sky to catch fish, but I can see through the 100-meter-deep sea at a glance, and schools of golden fish are chasing me! Others gamble on stones by guessing, but I can see through the stubborn stones at a glance, and the warehouse is full of imperial green jadeite! Others are afraid of storms when going to sea, but I can see my luck at a glance, and thousands of tons of sunken shipwreck treasures are delivered to my door! I built my own business empire step by step, and pampered my sister-in-law who used to cry so much that she became a magnificent business queen. However, the way my sister-in-law looks at me is getting more and more wrong.