Black Dog: Being A Teacher

Black Dog: Being A Teacher is a 2019–2020 South Korean television series starring Seo Hyun-jin, Ra Mi-ran and Ha Jun. It aired on tvN's Mondays and Tuesdays time slot from December 16, 2019 to February 4, 2020. It is a well-made drama in which viewers sympathized greatly with the realistic situation, conflicts and villains facing fixed-term teachers in the drama.

Synopsis
Go Ha-neul (Seo Hyun-jin) becomes a temporary teacher at a private school, but she faces many struggles in her new position. However, she's determined to do her best and help her students as they face the various trials that exist in the highly competitive private school setting. With the guidance of Park Sung-soon (Ra Mi-ran), the head of the school's career counseling department, and Do Yeon-woo (Ha Jun), a Korean language teacher with an unwavering passion for teaching, Go Ha-neul finds the strength to overcome the challenges of teaching in today's cutthroat education system, growing both as a person and a teacher.

Main

 * Seo Hyun-jin as Go Ha-neul
 * After a teacher saved her when she was a student, Ha-neul decided to become one herself. Years later, she starts working as a temporary teacher at a private high school and, through struggles, grows as a teacher and as a person.


 * Ra Mi-ran as Park Sung-soon
 * An experienced teacher who becomes Ha-neul's mentor. She is a Korean language teacher and Head of College Admission, and is known as a workaholic among the students.


 * Ha Jun as Do Yeon-woo
 * A Korean language teacher who is very popular among students.

Supporting

 * Lee Chang-hoon as Bae Myeong-soo
 * Baek Eun-hye as Song Chan-hee
 * Lee Hang-na as Song Young-sook
 * Jung Hae-kyun as Moon Soo-ho
 * Kim Hong-pa as Byeon Seong-joo
 * Yoo Min-kyu as Ji Hae-won
 * Park Ji-hwan as Song Yeong-tae
 * Lee Eun-saem as Jin Yoo-ra
 * Jo Yeon-hee as Kim Yi-boon
 * Lee Yoon-hee as Lee Seung-taek
 * Heo Tae-hee as Ha Soo-hyeon
 * Ye Soo-jung as Yoon Yeo-hwa
 * Park Yu-rim as Ryu Jin-hee

Special appearances

 * Ryu Ji-eun as young Go Ha-neul
 * Tae In-ho as Kim Young-ha, Ha Neul's former high school teacher (Ep.1-2)
 * Woo Mi-hwa as Han Jae-hee (Math and creative experience teacher)