Notorious serial killer Lee Ren-yao receives an interview from a documentary crew, triggering a string of mysterious events tied to a buried past.
A film crew covers the case of an infamous killer for a documentary. Pin-yu starts to have strange visions and encounters in her new house.
A teenage Jen-yao faces a difficult time at home and forms a friendship with a dancer in school. In the present, Pin-yu continues to see the ghostly girl.
While on assignment at Jen-yao's old house, Pin-yu finds a photo connected to her visions. In the past, a teenage Jen-yao gets into an accident.
As Hsiao-tung and Jen-yao grow closer, their bond deepens, sparking jealousy from someone who secretly has feelings for her.
A nasty rumor spreads in school about Hsiao-tung and Jen-yao. As school authorities get involved, a friend takes the fall while tensions grow in class.
Jen-yao leaves home, Hsiao-tung and Yun-chen take a trip together. Yun-chen makes a life-changing choice. In the present, Ta-wei finds a shocking video.
Jen-yao faces the ultimate betrayal when someone close frames him for crimes he did not commit, making him a wanted man.
Wanting to support Jen-yao, Hsiao-tung attempts to get closer to Ouyang Ti. But as the night progresses, the situation takes a dangerous turn.
Seeing her hurt and in pain, Hsiao-tung's mother promises that she will get justice for her. An enraged Jen-yao decides to plot for revenge.
On the rooftop, Hsiao-tung and Jen-yao make a promise to meet in five years. On the streets of Taipei years later, Jen-yao encounters a familiar stranger.
Jen-yao starts a friendship with a blind radio DJ. At a hospital, a ghost from the past triggers Che-li.
Tien-ching and Jen-yao start spending more time together. Che-li's guilty conscience haunts him, sparking flashbacks to that night in high school.
After the traumatic night she had, a teenage Hsiao-tung spirals into a bad state. In the present, Jen-yao finds out the truth about Tien-ching.
Big K advises Jen-yao not to get involved with Ouyang Ti and his gang. At a high school reunion, Hsiao-tung's name sparks gossip.
Tien-ching worries when Jen-yao doesn't answer his phone. Ouyang Ti looks all over town for Wei-ting but is nowhere to be found.
Tien-ching confronts some unsettling truths that shake her to the core. In a moment of impulse, Jen-yao makes a choice that changes everything.
A familiar figure from his past turns up at Jen-yao's place. Shen Mu tells Jen-yao that she knows of his dark secrets.
The wave of brutal murders makes it on the news. Jen-yao forms an unexpected alliance with Shen Mu.
The murders continue. Jen-yao commits one last act of violence before turning himself in.
Jen-yao gets an unexpected visit from a loved one and experiences a bittersweet moment as he faces his fate.
Complete episode guide for Had I Not Seen the Sun with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
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