Wangfei de Xiu Xian Zhinan
王妃的修仙指南
Prequel
Princess’s Happily-ever-after Marriage
Wangfei de Hun Hou Zhinan· 王妃的婚后指南
manhua
and 6 more
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An ace killer in modern time got a time travel and reborn into a princess, whose husband is a powerful genius in the country. Being obedient and submissive to her husband and friendly to his concubines? No way! if you dare to challenge, just have a try! (Source: Manga Toon)