I'm Done Chasing You, Jiang Nannan. What Do You Have to Regret?

[No cheating, villain protagonist, decisive and ruthless, willing to do whatever it takes!] Xu Sishi transmigrates into Douluo Dalu: The Unrivaled Tang Sect, becoming the ill-fated male supporting character Xu Sishi. Yes, that Xu Sishi: the fool who is young master of the Xuanming Clan, possesses royal blood, has a partially awakened Black Tortoise Martial Soul, and obsessively fawns over one woman. At Shrek Outer Court, Xu Sishi is in the middle of his ninety-ninth confession to Jiang Nannan. [Ding! Fawn over one person and you’re a dog; fawn over ten thousand and you’re a wolf... Host, complete the confession to obtain the Simp System.] [Ding! There are plenty of fish in the sea. Why fixate on one flower? Preserve the last shred of a man’s dignity and receive the Regret System as a reward.] Xu Sishi decisively chooses the second option. He isn’t the lovesick fool from the original story. A flower may be beautiful, but it won’t make him give up the entire forest. “Xiaotao, you don’t want your evil fire to keep affecting you, do you?” “Tang Ya, don’t turn around. It’s me, Beibei.” “Teacher Xian Lin’er, I only want to study Soul Tools.” Afterward, he awakens the complete Black Tortoise form and becomes Shrek’s number one in soul duels. His Black Tortoise Power at the All-Continent Tournament leaves the world in shock... He inherits the Xuanming Clan, ascends the throne as emperor of the Dou Ling Empire, and conquers the Heaven Dou Empire, uniting the Heaven Dou lands. On the first day without Xu Sishi, Jiang Nannan felt that things were much quieter. On the seventh day without Xu Sishi, admirers came swarming, annoying her endlessly. Then she watched Xu Sishi climb to the very top, until the difference in their status and position made them seem like people from two different worlds. “Xu Sishi, you scumbag! Why couldn’t you just keep trying? What if I’d been moved?” From then on, she would compare everyone to him, but none of them came close.