At the age of 8, Park Joo-Hyeong went to Italy after he was adopted. He is now an adult and has the name of Vincenzo Casano. He is a lawyer, who works for the Mafia as a consigliere. Because of a war between mafia groups, he flees to South Korea. In South Korea, he gets involved with Lawyer Hong Cha-Young. She is the type of attorney who will do anything to win a case. Vincenzo Casano falls in love with her. He also achieves social justice by his own way.
Taecyeon will transform into Jang Jun-woo, an intelligent and hardworking first year intern at a law firm. He is from a middle-class family and is polite and sincere. Despite his boyish charms and good looks, Jun-woo is a bit awkward and innocent and often makes mistakes in his job that get him into trouble.