[Villain + System + Non-Single + Cruel and Merciless! Those who mind please do not enter! ]

Original title: [Giving the protagonist's mother a massage at the beginning]

Accidentally traveled through time and space to become the male protagonist's younger brother

From then on, everything went wrong for the male protagonist.

My girlfriend kept looking down on me, and even my mother started to hate me.

Little did he know that his younger brother was behind all this.