

Both are sequel series that feature a plot-driven continuation of the original work, which is more character-driven.
both feature a teen/young adult who was previously timid and bullied, trying to live their lives normally after committing a life-altering act of violence that has hardened them into numb, unfeeling people with soft spots for those they care about
both lead characters are extremely weak at first, yet refuse to back down, either using their perseverance or intelligence to battle against stronger opponents despite their physical disadvantages
both feature the main characters getting caught up with a larger organisation, and personally attacked by the leaders of said organisation, whom they must battle with using hand-to-hand combat
both are tales of the underdog who only fight to protect the people and friends they love
both feature a teen/young adult who was previously timid and bullied, trying to live their lives normally after committing a life-altering act of violence that has hardened them into numb, unfeeling people with soft spots for those they care about
both lead characters are extremely weak at first, yet refuse to back down, either using their perseverance or intelligence to battle against stronger opponents despite their physical disadvantages
both feature the main characters getting caught up with a larger organisation, and personally attacked by the leaders of said organisation, whom they must battle with using hand-to-hand combat
both are tales of the underdog who only fight to protect the people and friends they love













Two friends, Kyung Min and Detective Jong Suk, reconnect after receiving a message from a friend they haven't heard from in 20 years. The message triggers painful memories of their school bullying, and soon after, a series of mysterious murders begin. As Jong Suk investigates, he uncovers connections to the past, while the drama explores the origins of school violence and its enduring impact on society.