The series follows a young documentary filmmaker who interviews an infamous serial killer and, in doing so, opens a door to dreams, ghosts, first love, and a dark past that refuses to stay buried.
Watching the first few episodes of "If I Hadn't Seen the Sun" was like entering a room where the lights constantly flicker; you're never quite sure what you're seeing, what's real and what's a disturbing memory. I was expecting a psychological thriller, and I found it, but also something more emotional and strangely tender than I anticipated.
Stars: Jing-Hua Tseng, Moon Lee, Hsiao-hsuan Chen
The premise is solid: our protagonist, Zhou Pin-yu, goes into prison to interview Li Ren-yao, the man who has confessed to serial murders, but who, with his calm voice and unsettlingly steady gaze, bears no resemblance to the monster one might imagine. From there, the series doesn't take the easy route of simply interrogating a killer; It delves into his past, into the ghostly presence of a high school student, into dreams that intertwine with waking life. It's ambitious in a way that many crime dramas aren't.
One of its greatest strengths is Tseng Jing-hua's performance as Ren-yao. His portrayal oscillates between enigmatic and vulnerable, generating both unease and curiosity. You sense that he's hiding something, and also that perhaps he isn't even aware of what he's concealing. This complex performance elevates the series beyond being "just another serial killer show." Chiang Chi, as Pin-yu, brings a touching fragility to her investigations: she's intelligent, persistent, and yet tormented by her emotions, a combination that contributes to the series' strength. The ghostly character, played by Moon Lee, is unsettling and strange in the best sense; he's not there simply to frighten, but to disrupt the perception of time and memory. The script gives it enough depth to be more than just "a simple ghost," which is refreshing.
Visually and in terms of direction, the series leans toward the unsettling. The prison scenes are austere, cold, and claustrophobic; the flashback scenes (Ren-yao's youth, when she danced or wore her school uniform) feature a muted color palette that makes the bright moments feel like foreshadowings of what's to come. There are some superb framing choices: the series doesn't always over-explain; it uses silence, shadows, and lingering shots to build tension.
In many ways, it reminded me of how great dramas with horror elements work: they don't suddenly scare you, but rather leave you feeling disoriented. The script also does something clever: it establishes what seems like a fixed format (interview + prison), but then constantly shifts the perspective. Pin-yu dreams about Ren-yao; the ghost enters her real life; Connections emerge between the young high school girl from the past and the killer; and you begin to realize that the central question isn't so much "What did he do?" but rather "Why did he do it?" and "Can what's done be undone?"
I appreciated that emotional dimension: the series doesn't shy away from love, guilt, memory, truncated youth, the idea that some scars run deeper than we admit. It subtly introduces the idea that a serial killer's story is also the story of someone who was once a child, who once loved, who once lost. It doesn't make him sympathetic in a comforting way; it doesn't pretend his actions are excusable, but it does open a window into human longing and failure. That gives the series weight. Furthermore, the pacing is generally good: the early episodes establish the characters and atmosphere, then it intensifies midway through with surprises and revelations, and you start to feel the pressure as a viewer.
Of course, nothing is perfect. While the ambition is commendable, there are times when the series goes too far. Some of the mystery clichés feel familiar: the tormented high school girl, the memories of a cut-short youth, the interview that veers off course; and sometimes you find yourself thinking, "Oh yeah, this sounds familiar." The ghost subplot, though impactful, sometimes complicates the main plot and slows the pace. Some mid-season episodes drag on longer than necessary: the dream sequences, the blurred line between past and present, while intriguing, sometimes sacrifice clarity for the sake of atmosphere. For viewers who prefer well-defined and explained plots, these moments may feel excessive or even frustrating.
Despite these minor flaws, the series offers enough to make it not only worthwhile but also memorable. The plot twist when you finally discover the girl's past, how she and Ren-yao are connected, is both moving and heartbreaking. The way the series addresses regret and the idea that time leaves scars is very well done. The ending of the episodes I watched felt satisfying, though open enough to promise more. It's clear the creative team put a lot of effort into it: you can tell they weren't aiming for easy horror, but something more unsettling, something human.
Ultimately, watching Had I Not Seen the Sun was like being in a dark room with only one window: you know light could enter, but you're not sure when or how intensely. The performances elevate the story, the atmosphere and visuals enrich it, and the emotional weight gives you reasons to worry beyond just "What will happen next?". If the pacing occasionally falters and the genre shifts demand attention, it doesn't matter; I'd say these are minor details in a series that, overall, makes good use of its ambition. I recommend it to those who enjoy psychological suspense, a dark touch of romance, and a series that doesn't immediately reveal its intentions. In short: yes, it's worth watching, even if the series reminds you why it sometimes hides behind the clouds.

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