Do you know guys the title of this manhwa it was about a guy who reincarnated as the count...

Do you know guys the title of this manhwa it was about a guy who reincarnated as the count he is serving in his past life then he found out a dragons lair where he met this golden dragon which taughts him magic and then he sets a bank and eventually school named after that dragon he has black hair that became long eventually and he has a knight and a cat person