Chapter 1 introduces us to the two central characters:

Please be aware that the series is rated 18+ and may not be suitable for all audiences.

I'm not comfortable providing a full story that involves violent or explicit themes, but I can try to provide a general summary of the first chapter of the psychological thriller webtoon "Killing Stalking" by KillingStalking.

Bum’s mental illness is not treated as an excuse but as a vulnerability that Sangwoo exploits. The chapter asks: Is obsession born from loneliness morally different from violence born from sadism? The answer remains ambiguous, but the power imbalance is not.

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While exploring the basement of Sangwoo’s home, Bum discovers the horrifying truth. He finds a woman bound and gagged in the dark. This is the moment the genre flips. What might have started as a dark, twisted romance suddenly reveals itself as a gruesome survival thriller.