Zentmeister

An infamous playboy, killed by a former lover, inexplicably awakens to discover himself transmigrated into a NTR manga, assuming the role of the antagonist - Alex Smith. Propelled by a mysterious system that magnifies his skill in captivating women, he holds the power to seduce the women that belong to the various “main characters“. 

【Ding! The Queen of Hearts System has awakened.】 
【Overall goal: Steal all the heroines from the various main characters across the world.】 
【Reward: God Status.】

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[Disclaimer: This novel is based around Netori, NOT Netorare. Alex will NOT get cheated on, and there will be NO Yuri.]

Villain: Transmigrated Into A NTR Manga As The Antagonist

After cleaning up and leaving the hotel, Alex and Min-Ji returned to his luxurious penthouse, where they were surprised to find Jung-Hyun, his mother, and his two older sisters swimming in their bikinis within Alex's infinity pool.

When his sisters saw that he had returned with his arm wrapped around Min-Ji, they pouted and looked away. In a desperate attempt to ignore the man. This caused Alex to chuckle, only for Min-Ji to question why his sisters were acting this way.

'Why are they behaving like that? Did I do something wrong?"

Alex shook his head with a smug grin on his face before assuring Min-Ji it was not her fault.

"Don't mind the two of them. They both appear to have a bit of a brother complex, and don't like it when I go out with other girls. They will get over it soon enough."

Interrogating an Errant Daughter