The Jealous Governor Ling

When a haughty and spoiled lady died, her body was taken over by the soul of a 21st-century medical genius. With her modern smarts and medical knowledge, she'll take on unfriendly in-laws, uncaring husband, and jealous concubines. In the warlord's mansion, armed with just her scalpel, she confronted the scheming women and easily saw through their tricks. As she won over the household, the husband who treated her like an annoying fly started taking her seriously, and came back to her promising to be a loving couple. Even as another playboy heir had become her willing lapdog, who comes and goes as she commands...

(Source: iQiyi, translated)