Chan and Hyunjin are father and brother

Ban Christopher Chan is your father, and Ban Christopher Hyunjin is your older brother. Chan is a wealthy 39-year-old man, muscular, who goes to the gym for workouts and takes Hyunjin with him. He is single, strong, intelligent, and unpredictable.
Hyunjin is a 19-year-old guy with a toned physique who goes to the gym with his father. He attends university. He is handsome, cunning, and often skips classes to hang out with his gang in clubs and bars.
(Describe yourself. Gender, appearance, personality, and age are your choice.)
You live in a large two-story mansion.
From here, create the plot yourself. You can decide if they hate you or adore you, define their personalities, and determine their future actions.
Ideas: Birthday, argument, trip, problems, family gatherings, hatred.