I Became the Young Wife of the Martial Arts Novel's Male Lead무협지 남주의 어린 아내가 되어 버렸다; Muhyeopji Namjuui Eorin Anaega Doeeo Beoryeotda; I Became the Young Wife of the Male Lead in a Martial Arts Novel; 男主人公の若妻に転生してしまいました

I possessed the body of the distant ancestor of the male lead in a martial arts novel where he dominates everything. To faithfully fulfill my role of supporting him, I worked myself to the bone and established the greatest family. After that, I peacefully closed my eyes. "What? My family has collapsed?!" When I opened my eyes again, 300 years had passed. The family I had painstakingly built was on the brink of ruin. On top of that, the male lead I dedicated my life to cheering for was about to enter a humiliating political marriage with the villainess from the original story. But the biggest problem was... "Why did I become that villainess!"