There is a man (played by Ryeoun) who has taken the lives of 17 people. Yet, he insists he is not a murderer. Instead, he claims to possess the ability to cure any disease, arguing that these sacrifices were an unavoidable necessity for the sake of humanity. How should we judge a man who calls himself a savior rather than a serial killer?

This provocative premise lies at the heart of Bloody Flower, a series based on author Lee Dong-geon’s novel The Flower of Death. The original story throws the audience into a messy debate over right and wrong, capturing the exact kind of dark suspense you want from a thriller. The live-action adaptation doubles down on these controversial, unanswerable questions, significantly amplifying the intrigue.

If the moral ambiguity and dark tension of Bloody Flower kept you on the edge of your seat, here are four more highly acclaimed Korean series adapted from fascinating novels and webtoons that you need to add to your watchlist.

Strangers From Hell (2019)

Just looking at the decaying building on the outskirts of Seoul is enough to make your skin crawl, and its residents are equally unsettling. Naive and newly entered into the workforce, Jong-woo (Yim Si-wan) is forced to move into this cheap, cramped boarding house (goshiwon) due to his tight budget. From that day forward, Jong-woo is plunged into a living nightmare, as madness and anxiety slowly consume him.

Based on the shocking webtoon Hell is Other People, Strangers From Hell is still widely regarded as one of the greatest webtoon-to-drama adaptations to date. Utilizing the inherently isolating and claustrophobic nature of a goshiwon, the drama paints an extreme, deeply unsettling portrait of a modern-day hell, generating a dark and suffocating tension. A major highlight is Lee Dong-wook, who plays a spine-chilling character created specifically for the show, masterfully walking the tightrope between good and absolute evil.

Save Me (2017)

When their family falls on hard times, Sang-mi (Seo Yea-ji) and her parents move to a small rural town seeking a fresh start, only to find a community entirely swallowed by a religious cult. The white-haired cult leader (Cho Seong-ha) hides his sinister intentions behind a gentle smile, preying on the vulnerable family with a false sense of hope. Meanwhile, a group of hot-blooded local youths (Ok Taec-yeon, Woo Do-hwan) brave countless dangers to rescue Sang-mi from the clutches of the cult.

Adapted from Jo Geum-san’s webtoon Out of the World, Save Me brilliantly explores how a pseudo-religion can sneak into the daily lives of ordinary people. Adding a layer of realistic horror, the cult leader in the drama bears a striking resemblance to a real-life cult figure who once sparked massive controversy in South Korean society. While the subject matter is undeniably heavy, the narrative of young men fighting back against a massive organization to protect this girl lends the series a subtle touch of youth romance.

Avengers Social Club (2017)

At first glance, Mi-sook (Myung Se-bin) looks like an elegant, high-society housewife, but behind closed doors, she suffers from severe domestic violence. Do-hee (Ra Mi-ran) is a hardworking mother whose son is facing a crisis at school due to the rich bullies abusing their power. Enter Jung-hye (Lee Yo-won), a woman who has all the money in the world but cannot have a child. Enraged by her husband’s betrayal, she approaches the other two women with a simple proposition: “Would you like to get revenge together?” The trio is soon joined by their youngest member, Soo-gyum (Lee Jun-young), the illegitimate son of Jung-hye’s husband.

When we hear the word “revenge,” we typically expect something dark and gruesome, but Avengers Social Club takes a much fresher approach. The members start with petty, everyday sabotage, gluing chairs, throwing cold water, and sneaking laxatives into drinks, eliciting plenty of laughs. However, their targets are anything but light. Based on Sajatokki’s webtoon Buam-dong Revenge Social Club, the series tackles highly relatable societal issues like domestic abuse, school bullying, sexual harassment, and elite power-tripping. United by a common goal, these women punish their tormentors and ultimately reclaim their own lives.

The Running Mates: Human Rights (2019)

Prosecutor Hong-tae (Choi Gwi-hwa) is a man whose actions often precede his thoughts. Because of his unconventional sense of justice, he is branded an “anti-human rights prosecutor” and reassigned to an ironic new post: the Human Rights Promotion Commission. There, he meets Yoon-seo (Lee Yo-won), an investigator who plays strictly by the book. Though they are polar opposites who constantly clash, the duo must team up to investigate the cases filed with the commission.

Unlike traditional crime procedurals, The Running Mates: Human Rights zeroes in specifically on “human rights” violations. Adapted from Song Si-woo’s hit novel, the drama was praised for using realistic mysteries to highlight social issues in South Korea, positioning its investigators as detectives for the marginalized. Covering highly realistic cases ripped straight from the headlines, workplace sexual harassment, child abuse, discrimination against foreign workers, and more, the series guarantees an immersive, high-stakes watch.

All of the dramas mentioned above are currently available to stream for free on Amasian TV.