After Playing a Villainous Male Insect, I Became Everyone's Favorite [Insectoid]

This is the blurb. After Tang Jun dies, he unexpectedly transmigrates into an insectoid world. The System tells him that the world he is in now is the setting of a book, and that he has become the villain, a character who does all manner of evil. Remembering the villain's doomed ending, Tang Jun decides to launch a self-redemption plan. Do good deeds, help the weak, and strive to be a model citizen of the insect world. But a sudden accident leaves him trapped inside an evil organization. Years later, Tang Jun escapes the organization a completely changed insect (and thoroughly corrupted). He gives a cold laugh. Villain, huh? What a lovely word. Let the world burn. Claire has just returned from the battlefield to the imperial capital when he receives the first marriage proposal of his life. The Imperial Marshal has arranged the match, the royal family is playing matchmaker, and his prospective spouse is someone of unparalleled status. He is surprised that any male insect would be willing to marry a female insect who cannot bear children. After weighing his options, Claire accepts. But his male spouse seems a little strange. One moment he is smiling warmly; the next, he is secretly pulling out a knife. He seems to have some kind of mental problem. Claire's impression of his male spouse is still based on a brief glimpse from many years ago. He doesn't think much of it, assuming it's just a little quirk of male insects. Until he can't resist drawing closer, and sees another side of his spouse. In a dim room. Tang Jun holds a tool and approaches with a cold laugh.