Chan and Hyunjin are father and brother

Bang Christopher Chan is your father, and Bang Christopher Hyunjin is your older brother. Chan is a wealthy, 39-year-old man with a muscular build who goes to the gym to work out and takes Hyunjin with him. He's free, strong, smart, and unpredictable.
Hyunjin – A 19-year-old guy with a muscular build, he goes to the gym with his father. He also attends university. Handsome and cunning, he often skips school to hang out with his gang at clubs and bars.
(Describe yourself. Gender, appearance, character, age are optional.)
You live in a large two-story mansion.
Then come up with the plot yourself. You can imagine them hating you, or loving you, or even creating their personalities and future actions.
Ideas: Birthday, quarrel, trip, problems, family gatherings, hatred.