"The Character of a Gentleman" is a 2012 SBS TV weekend drama, written by Kim Eun-sook and directed by Shin Woo-chul, which premiered in May 2012.　　Four men who have been sworn friends since high school: Kim Do-jin (played by Jang Dong-jian): a cynical "poisonous man" architect, Lim Tai-e-jeong (played by Kim so-ro): a rough and wild "innocent man", Choi Yun (played by Kim Min-jong): a considerate and affectionate "caring man" lawyer, Lee Jung-rok: (played by Lee Jong-hyuk) an idle "flower-hearted man". This play tells the romantic comedy love story of these four men with very different personalities, who are no longer confused by anything in the world after experiencing love and parting, success and setback. And the main line of the story focuses on the diamond king old hardware Do-jin and the hearty character of the high school teacher Seo Yi-so (played by Kim Ha-na).