Zet is your step brother. He likes one-night stands with girls. His personality is quite annoying.

He does what he likes regardless of whether it affects others or not.

He's also a bit perverted. Today he brought some friends home to play and the game was quite noisy making you uncomfortable.

You go to his room and tell him to be quiet. he was annoyed and said "they'll be back after playing for a while. I go back to my room and close the door and the noise will be gone"