TV series
Stand to protect it.
With the aid of unexpected friends, a gifted but introverted student confronts bullies and violent foes — unaware of how dangerous his world will become.
Streaming, rental and purchase options
Checked Jul 22, 2026
Weak Hero is available to stream on Netflix and OnDemandKorea in United States. Use the direct links below to open the provider.
With the aid of unexpected friends, a gifted but introverted student confronts bullies and violent foes — unaware of how dangerous his world will become.
Choose an episode, then use the watch options above for the show.
Episode 1
Still affected by what happened to Su-ho, Si-eun withdraws from others. Seo Jun-tae contemplates taking a stand against the bullies — despite the risks.
Guest stars Kong Hyun-joo, Jeon Su-ji, Lim Ho-jun
Episode 2
After being saved by Si-eun, Jun-tae attempts to befriend him — but both are soon dragged into Choi Hyo-man's revenge plot involving Go Hyun-tak.
Guest stars Lim Ho-jun
Episode 3
While doing volunteer work as punishment for fighting, Si-eun begins to form a bond with new friends — but trouble continues to find him.
Guest stars Kong Hyun-joo, Lee Myeong-ro, Oh Gi-gwang, Jang Jun-whee, Jeon Bae-soo, Bae Jun-hyung
Episode 4
After Geum Seong-je crosses the line, Si-eun strikes a deal with Na Baek-jin — leaving Park Hu-min, Hyun-tak and Jun-tae alone in the violent crosshairs.
Guest stars Lee Myeong-ro, Oh Gi-gwang, Jeon Bae-soo, Kang Hak-soo
Episode 5
Worried for his father and backed into a corner, Hu-min confronts Baek-jin. Si-eun considers studying abroad after clashing with his distressed mother.
Guest stars Cho Jung-seok, Kong Hyun-joo, Lee Myeong-ro, Oh Gi-gwang, Lim Ho-jun, Jeon Bae-soo, Son Bo-seung, Jung Hyeon-jun
Episode 6
Si-eun, Jun-tae, and Hyun-tak seek out Hu-min, who has decided to work with Baek-jin to keep the peace. Still, Hu-min finds it difficult to comply.
Guest stars Cho Jung-seok, Lee Myeong-ro, Oh Gi-gwang, Jeon Bae-soo, Jung Hyeon-jun
Episode 7
As Si-eun's absence leaves a gap, Baek-jin presses on with his violent mission. In response, Hu-min rallies his school and challenges him to a showdown.
Guest stars Cho Jung-seok, Kong Hyun-joo, Lee Myeong-ro, Oh Gi-gwang, Jeon Bae-soo, Son Bo-seung, Bae Hyun-kyung
Episode 8
Hu-min, Hyun-tak and Eunjang students gather to engage in a final confrontation against Baek-jin's gang. In the end, who will prevail?
Guest stars Cho Jung-seok, Kong Hyun-joo, Lee Myeong-ro, Oh Gi-gwang, Jeon Bae-soo, Son Bo-seung, Shin Mi-yeong
Episode information updated Jul 24, 2026
Park Ji-hoonYeon Si-eun
Choi Hyun-wookAhn Su-ho
Hong KyungOh Beom-seok
RyeounPark Hu-min
Lee YeonYeong-i
Choi Min-yeongSeo Jun-tae
Yoo Su-binChoi Hyo-man
Kim Su-gyeomJeon Yeong-bin
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