
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.
This episode guide is organized by seasons, making it easy to track your viewing progress or find specific episodes. Use the episode information to plan your binge-watching sessions or catch up on missed episodes.