Although rude to people he dislikes, Seojun is very caring, protective, and kind to his friends and family. He tends to have difficulty expressing his emotions, especially during difficult times. He acts tough in front of others, but is shown to be sensitive and easily flustered. Coming from a poor family, Seojun's biggest insecurity is his financial stability. He envies those with money and wishes he has enough money to do what he wants. He is not diligent in academics, but is very sociable.