He is handsome and excelled in school. He currently works in the wealth management division of a large bank. When he was younger, he was a sickly child and this caused his mother a lot of worry. Because he knew his single mom was always struggling, he made an extra effort to not cause any problems at home even when he was a teenager entering puberty. All his life, he tried to be a good son. He does not understand why his younger brother, Kang-jae, constantly lives recklessly. He asks himself why on earth did the gods give him a brother like that.
