Episode Title: Hae Seong's Father's Notebook
The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The revelation is shocking, and he storms the NIS for answers. The answer pushes him away from the mission, and he takes time off. However, he resolves to continue but returns only to discover Su A witnessed it all.
(Source: Viu)
- Aired: March 08, 2025
Undercover High School Recent Discussions
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 | After 4 episodes, how do you see the rest of the kdrama? by Luus | 6 | 0 |  sekc Aug 11, 2025 |
| ROMANCE ASPECT.. by Hee-Jin | 24 | 0 |  elliewashere2 Apr 10, 2025 | |
 | Review article on Undercover High School by Cho Na | 1 | 0 |  Shinnosuke_Lee Mar 30, 2025 |
Undercover High School Episode 6 Reactions
Both actors seo kang joon and jin ki joo Your acting was truly amazing! I loved watching your perform. Your expressions,action scene, movements,emotion and tone of voice were all perfect. You made the story feel real and relatable.I appreciate the hard work your put into your role.I look forward to seeing more of your performances.
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Spoilersssssss
Finally Ms Oh knows who he is. Huh, i thought the shadow figure was Chairman but it ended up being Ms Oh...damn she be working too much as a teacher, being onsite until 12am and back next morning for class...wth! (I know just a drama)
Im happy he has someone to help him out. LOVE is in the airrrrrr🥳
Finally Ms Oh knows who he is. Huh, i thought the shadow figure was Chairman but it ended up being Ms Oh...damn she be working too much as a teacher, being onsite until 12am and back next morning for class...wth! (I know just a drama)
Im happy he has someone to help him out. LOVE is in the airrrrrr🥳
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I myself love this drama. There’s some spots where I think it’s wowed that a teacher gets way to noisy in the storyline. I hope next week it will get more interesting!
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Ele mentindo pra ela KKKKKKKKK mas finalmente a diva descobriu 🙏🏽No fundo no fundo ela deve tá tão feliz que ele não é um estudante KKKKKKK Eu vejo ela mais como prima do que como irmã dele ELE FALANDO QUE VAI PROTEGER ELA AAAAAAAAMEU CASAL A única pessoa que sabia que ele tava lá analisando quem trabalhava na escola foi o chefe dele, então foi ele que falou pra ela? Só pode né... E ele é todo desconfiado, tem caroço nesse angu"Encaminhe essa mensagem para ele no NIS" é ele sim viuNão pode ser o pai dele né? Tô nervosa agora QUE SUSTO DA PESTE KKKKKKKKKKKKKKKKKKKKKKKKKKKK SOCORRO Ela elogiando ele pras fotos, af que dupla incrível ELES DANDO AS MÃOS MINHA DUPLAAAAAAQUANDO VÃO DESCOBRIR QUE ELES SE CONHECEM DESDE CRIANÇA ELE DESCOBRIU AAAAAAAAAAA VOU CHORAR!!!!!! AS PORTAS PARA O AMOR ESTÃO ABERTASEla perguntando quem era o primeiro amor dele e ele descobrindo que o primeiro amor dele está ao lado dele 😭Será que o pai dele tá vivo?
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