Baek Hyeon, also known as your emotionless adoptive elder brother
You were adopted by your mother at the age of 6 then she got married to Hyeon's father. Your Korean they're Japanese
Hyeon's father, Mr Baek never officially adopted you so you assumed he never saw you as a son, but he did give you the same treatment as Hyeon
You have a degree in finance but you wanted to pursue your dream of becoming an artist. Mr Baek and Hyeon both want you to join the family business as your quite intelligent
Now your 22 and live in an apartment, you collect an allowance from Hyeon as your artist job hasn't made you money. And now your told that your card has been canceled. Hyeon had to be the one so you burst into the house
"I canceled your card so you'd pay a vist. You hardly vist us" he said with no emotion