Class of Lies

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Class of Lies
Class of Lies.jpg
Promotional poster
Also known asUndercover Teacher
Hangul미스터 기간제
Created byStudio Dragon
Written byJang Hong-cheol
Directed by
  • Sung Yong-il
  • Park Ji-hyun
Country of originSouth Korea
Original language(s)Korean
No. of episodes16
Camera setupSingle-camera
Running time60 minutes
Production company(s)JS Pictures
Original networkOCN
Picture format1080i (HDTV)
Audio formatDolby Digital
Original releaseJuly 17 (2019-07-17) –
September 5, 2019 (2019-09-05)

Class of Lies (Korean미스터 기간제; RRMiseuteo giganje; lit. Mr. Temporary) is a 2019 South Korean television series starring Yoon Kyun-sang, Geum Sae-rok and Choi Yu-hwa. It aired on OCN's Wednesdays and Thursdays at 23:00 KST time slot from July 17 to September 5, 2019.[1][2]


Gi Moo-hyeok is a snobby lawyer who goes undercover as a substitute teacher Gi Kang Jae in Chunmyung High School, an elite high school ranked in the top 0.1 percent to get to the bottom of a case involving the murder of a female student.



Gi Moo-Hyeok is a selfish and snob lawyer who only cares about money. He worked for the best law firm in the country, Songha. Moo-Hyeok was in charge defending a high school boy, Kim Han-soo, who was charged with attempted murder of Jeong Soo-ah. As substitute teacher, Gi Kang-jae teaches laws, politics, and German.
  • Geum Sae-rok as Ha So-hyeon
The earnest and awesome P.E. and counseling teacher at Chunmyung High School. She unconditionally trusts and supports her students. She also believes all her students are her “children”.
A criminal ace prosecutor from the legal department who has been the rival of Gi Moo-hyuk since the Judicial Research and Training Institute. She’s in charge of Kim Han-soo’s case.


Veritas Club members[edit]

Yoo Beom-jin is the top student who is perfect in everything. He has been respected as kind and genuine student according to his schoolmates. His father is Yoo Yang-gi, the country congressman and presidential candidate.
  • Choi Gyu-jin as Lee Gi-hoon
Lee Gi-hoon is the son of Lee Do-jin, Gi Moo-hyuk’s former boss and the president of Songha law firm. He takes an interest on camera film as an hobby and run school's photography club.
  • Han So-eun as Han Tae-ra
Han Tae-ra is Chunmyung High School’s queen bee. Her mom is Woo Eun-hye, runs a cram tutoring school. She and Yoo Beom-jin were well-known school couple by other students.
  • Kim Myung-ji as Na Ye-ri
Na Ye-ri is an idol trainee and the school’s self-proclaimed idol.

Chunmyung's students[edit]

  • Jang Dong-joo as Kim Han-soo
Kim Han-soo is an orphan. His dream is to become a P.E. teacher when he grows up. He was accused of stalking and murdering Jeong Soo-ah.
  • Jung Daeun as Jeong Soo-ah
Jeong Soo-ah is a murder victim. Kim Han-soo and her were childhood friends. They both grew up at the same orphanage until the age of 10. She is very smart and was one of the Veritas club members along with another 4 top students.
  • Byung Hun as Ahn Byeong-ho
Ahn Byung Ho entered Chunmyung High School through a program that provides support for children from lower-income families to study at the elite high school. However, he feels alienated and has been bullied by his classmates who looked down on him because of his social status. He named 'Poter' by the students.
Seo Yoon-ah is the president of the broadcasting club at Chunmyung High School. She has a bright personality and is considerate of others, but she is also very assertive of her opinions.
  • Sin Jae-hwi as Son Joon-jae
Son Joon-jae is a student who dreams of working in the finance industry. His father's business went bankrupt and he is being chased by loan sharks. His father fled overseas and left him and his mom behind.
  • Lee Bit-na as Lee Ji-Eun
Lee Ji-Eun is Seo Yoon-ah's junior in Chunmyung High School's broadcasting club.

Chunmyung's teachers[edit]

Lee Tae-seok is Chunmyung High School's general manager.
  • Woo Hyeon-joo as Jeon Young-hye
Jeon Young-hye is Chunmyung High School's senior teacher.
  • Seo Yoon-ah as Jo Mi-joo
Jo Mi-joo is an English teacher.
Sin Hye-soo is a Korean language teacher.
  • Yoon Ji-wook as Kang Woo-jin
Kang Woo-jin is a Music teacher.


  • Yoo Sung-joo as Lee Do-jin
  • Kim Min-sang as Yoo Yang-gi
  • Seo Ji-young as Woo Eun-hye

People around Gi Moo-hyeok[edit]

  • Lee Soon-won as Park Won-seok
  • Ji Chan as Song Jae-woo

Special appearances[edit]

  • Lee Jun-hyeok (Ep. 1)
  • Tae Won-seok (Ep. 1)
  • Lee Chae-kyung (Ep. 1-2)
  • Kim Tae-gyum (Ep. 2)

Original soundtrack[edit]

Class of Lies OST
Soundtrack album by
Various artists

Part 1[edit]

Released on July 25, 2019 (2019-07-25)
1."Win" (염따)YumDDaOh Byeong-juYumDDa2:59
2."Win" (Inst.) Oh Byeong-ju 2:59
Total length:5:58

Part 2[edit]

Released on August 8, 2019 (2019-08-08)
1."A Silver Spoon" (난 놈)
  • ODEE
  • QM
  • Park Eun-woo
  • Kim Tae-joon
  • ODEE
  • QM
2."A Silver Spoon" (Inst.) 
  • Park Eun-woo
  • Kim Tae-joon
Total length:6:32

Part 3[edit]

Released on August 28, 2019 (2019-08-28)
1."I'm Alive" (테일러)
  • Park Eun-woo
  • Mitch Auvenshine
  • Taylor
  • Kim Min
2."I'm Alive" (Inst.) 
  • Taylor
  • Kim Min
Total length:7:16


In this table, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.

Ep. Original broadcast date Average audience share
AGB Nielsen[3]
Nationwide Seoul
1 July 17, 2019 1.814% 2.452%
2 July 18, 2019 2.413% 2.760%
3 July 24, 2019 2.686% 2.913%
4 July 25, 2019 2.495% 2.515%
5 July 31, 2019 3.008% 2.806%
6 August 1, 2019 3.135% 3.413%
7 August 7, 2019 2.975% 3.505%
8 August 8, 2019 3.579% 3.976%
9 August 14, 2019 3.547% 3.668%
10 August 15, 2019 3.563% 3.985%
11 August 21, 2019 3.683% 3.562%
12 August 22, 2019 3.805% 4.141%
13 August 28, 2019 3.529% 3.911%
14 August 29, 2019 3.544% 4.188%
15 September 4, 2019 4.257% 4.760%
16 September 5, 2019 4.781% 4.665%
Average 3.301% 3.576%
  • This drama airs on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).


  1. ^ "'미스터 기간제' 오늘(17일) 첫 방송..'시간순삭' 시청 포인트 셋". News Chosun (in Korean). July 17, 2019. Retrieved July 17, 2019.
  2. ^ "학원드라마, 풋풋하다는 고정관념 버려라···'미스터 기간제'". Newsis (in Korean). July 16, 2019. Retrieved July 17, 2019.
  3. ^ "AGB Daily Ratings: this links to current day-select the date from drop down menu". AGB Nielsen Media Research (in Korean). Retrieved 2018-09-23.

External links[edit]