Reincarnation Paradise Park - Chapter 4: Weapon and Currency

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates

The king of assassins was reborn, mastering both alchemy and poison. Sitting inside the space, there was a ghost that loved crying.

During a luxurious cruise trip, he and she met unexpectedly~ Two months later, she was pregnant. They got married because of the child, but on their wedding day, he forced her to sign a divorce agreement. After the divorce, she thought they would have nothing to do with each other anymore. Who knew he would appear in her life again. When she went on a blind date, he showed up: “This is my ex-wife. She just separated from me.” When she went traveling, he followed her. She was furious: “We are already divorced, what do you want?!” “Let's get back together.” He started to pester her shamelessly. Given all the misunderstandings between them, how should she decide? Let's see who surrenders first~

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.