Actually no! The ML is not part of the novel's harem, he's a completely different guy and he will appear in the next chapter! (Ch.14) (BTW, he's super adorable)
If you are eager to see the Male Lead, here are some non-spoilery images from the manhwa with him on them:
https://funbe.cc/data/file/wtoon/15868905906864.jpg
https://funbe.cc/data/file/wtoon/15868906301543.jpg
https://funbe.cc/data/file/wtoon/15868908408249.jpg
https://funbe.cc/data/file/wtoon/15869824623034.jpg
I believe they will, because he's in the cover with her in the novel (I really hope they do!)
Here's the cover: https://img.ridicdn.net/cover/945054692/xxlarge
And in the manhwa cover he's the one lying on her lap while the novel's female heroine is in the back of our Female Lead (I hope they become friends or something, I need a good relationship between female characters in this kind of plots, please!):
https://postfiles.pstatic.net/MjAyMDA0MTNfMTM2/MDAxNTg2NzcxMzA4NDcw.wh-8G3E52zEHXdszfWNRxD55RJKSLYlO23BeF7fejHsg.mZv3XOFG3Rs7MLoWbSc6ypzvAORL3Y8lJcpC762Ikecg.JPEG.bms_epyrus/%EA%B7%B8_%EC%95%85%EB%85%80_%ED%91%9C%EC%A7%80.jpg?type=w773
I always wondered Why does the Villianess is so in love with the prince character if they are willing to cheat on her like that? This it’s not like other reincarnation mangas where the FL simply tries to avoid the bad ends, she goes in head first and get revenge!! I’m all for it! I wish it won’t have a cliche end where she and the prince will end up together she need some one better than that cheating overgrown man child!! All of the male characters so far are like a man child gets on my nerve!!