He help his classmate who is being bullied by a rich classmate | Itaewon Class

On the first day of attending his new high school, Park Sae-Ro-Yi (Park Seo-Jun) punches his classmate Jang Geun-Won, who was bullying another classmate. The bully is the son of CEO Jang Dae-Hee (Yoo Jae-Myung). The bully's father runs restaurant business Jagga where Park Sae-Ro-Yi’s own father works. CEO Jang Dae-Hee demands to Park Sae-Ro-Yi that he apologizes to his son, but Park Sae-Ro-Yi refuses. Because of his refusal, Park Sae-Ro-Yi gets expelled from school and his father gets fired from his job. Soon, an accident takes place. Park Sae-Ro-Yi’s father dies in a motorcycle accident caused by his ex-classmate Jang Geun-Won. Burning with anger, Park Sae-Ro-Yi viciously beats Jang Geun-Won. He is soon arrested and receives prison time for the violent assault. Park Sae-Ro-Yi decides to destroy the Jagga company and take revenge upon CEO Jang Dae-Hee and his son Jang Geun-Won. Once Park Sae-Ro-Yi is released from prison, he opens a restaurant in Itaewon, Seoul. Jo Yi-Seo (Kim Da-Mi), who is popular on social media, joins Park Sae-Ro-Yi’s restaurant and works there as a manger. She has feelings for Park Sae-Ro-Yi.