The Tenth Day

(The female protagonist is a workplace cannon turned into a rich man + the male protagonist is a villain + detective + suspense + fast time travel + another world) The male protagonist is a villain, not a kind person, so don't enter if you mind. The heroine soon became a rich man and became the daughter of the prime minister's house. The heroine, who is about to become a wealthy woman, is involved in the case when a female corpse suddenly appears in the pond. In order to find out the truth, she follows her fiancé, a businessman in disguise, who is actually the leader of a murderous organization with extremely high martial arts skills. The heroine comes to this end of the world with only one mission, which is to solve more cases. After completing her merits, she can come back from another world, turning her into an expert in solving crimes. Good news: She caught the big boss! Not lost by the villain. Bad news: She can't come back! What exactly is the problem? Later, after a lot of trouble, she finally sent herself back, but it seemed that she was not the only one who went back...