Park Yoon Ho

Yun Ga Min, a student at the struggling Yusung Technical High School, is determined to go to college despite his poor grades and knack for fighting. He forms a study group but is forced to use his fighting skills to protect his friends from bullies. His teacher, Lee Han Gyeong, who tutored him while he was a middle school student, returns as a temporary teacher with a secret and hopes to improve the school. (Source: MyDramaList) ~~ Adapted from the webtoon "Study Group" (스터디그룹) written by Shin Hyung Wook (신형욱) and illustrated by Ryu Seung Yeon (류승연).

Twin sisters Yoo Mi Ji and Yoo Mi Rae differ in everything except their faces. Yoo Mi Ji, the younger of the twins, has ended her short heyday as a promising track and field athlete and is currently living a free-spirited life. On the other hand, the older sister of the twins, Yoo Mi Rae, who has been walking the path of the elite since her school days, is a perfectionist working at a public corporation. The twins, physically identical but leading starkly different lives, embark on a bold charade, switching lives for some undisclosed reason. Lee Ho Su is a lawyer at a large law firm with a tall appearance and a seemingly carefree attitude. He may look like a noble swan with no external flaws, but he works harder than others to live an ordinary life, and this is because he has been living a different life than before after experiencing something in the past. As a result, he lives a calm life without showing his true feelings, but one day, an unexpected encounter occurs that sends waves through Ho Su's heart. (Source: Korean = Naver || Translation = MyDramaList)