Which romance novels had male protagonists with identities or assassin/mercenary backgrounds?

For example, the master of ambiguity

Answer 1

I recommend the following novels to you:

1. [Death Knell: The main character is an assassin and a mercenary. He transmigrated into the world of comics and has a prominent identity.]
2. "Rebirth: The Reborn Concubine: 13 Years Old": The female lead was an underworld killer. She transmigrated into the body of a 13-year-old thin girl, and her identity changed drastically.
3. "The Assassin Also Travels Through Time: Dancing Allure": The female lead was a cold-blooded killer who had traveled to another time and space and had an undercover identity.
4. "Mercenary: Beauty Under the World": The female lead was a killer who transformed into a hellish Asura, and at the same time, she fought for power in the palace.
5. "Personal Expert": The male lead was a genius mercenary who transformed into a small security guard in an ordinary high school. His identity had changed greatly.
6. "The Unscrupulous Demonic Concubine: The Evil Husband Requires Training": The female lead was a mercenary codenamed "Blood Fox". After transmigrating, she became the eldest daughter of the An family. However, she also had the identity of the young master of the demon world. Her identity was complicated.

I hope you like this fairy's recommendation. Muah ~😗