# Someday or One Day (2019–2020) — Celluloid TV fact sheet

Source: https://celluloidscore.com/shows/someday-or-one-day/
Last reviewed: 2026-08-31

| Field | Value |
|-------|-------|
| Celluloid Score | 86% |
| Celluloid Editorial Rating | 88/100 |
| Audience Snapshot | 94% |
| Metascore | 75/100 |
| IMDb | 8.9/10 |
| Fan Score | 92% |
| Creator | Huang Hsiu-chuan |
| Platform | Viki |
| Genres | Romance, Drama, Sci-Fi |
| Seasons | 1 (13 episodes) |
| Language | Mandarin |
| Country | Taiwan |

## Quick answer

Someday or One Day (2019–2020) is a Romance, Drama, Sci-Fi series created by Huang Hsiu-chuan, streaming on Viki. It holds a 86% Celluloid Score — Recommended — from Celluloid editorial (88%), Metascore (75/100), IMDb (8.9/10), TMDB fan (92%) across 1 season. Audience snapshot (not in the composite): 94%.

## Celluloid verdict

Taiwan's time-travel heartbreaker — Alice Ko and Greg Hsu's chemistry and a puzzle-box script earned critics' praise for emotional precision even when the sci-fi mechanics strained credulity.

## Synopsis

In 2019, a woman mourning her lost love receives a cassette player that transports her consciousness into 1998 — where she inhabits the body of a teenager and meets the boy who will become the man she lost. Huang Hsiu-chuan's time-travel romance mystery became a pan-Asian obsession.

## Cast

Alice Ko, Greg Hsu, Patrick Shih, Liu Guan-yu

## Critic reviews on Celluloid: 1

## Most searched questions

**Is Someday or One Day worth watching?**
Yes — Someday or One Day earns a 86% Celluloid Score (Recommended), from editorial 88%, Metascore 75/100, IMDb 8.9/10, TMDB fan 92%. Audience snapshot is separate (94%). Taiwan's time-travel heartbreaker — Alice Ko and Greg Hsu's chemistry and a puzzle-box script earned critics' praise for emotional precision even when the sci-fi mechanics strained credulity.

**Why is Someday or One Day so highly rated?**
Someday or One Day scores 86% from four inputs: Celluloid editorial 88/100, Metacritic 75/100, IMDb 8.9/10 and TMDB fan rating 92%. The separate audience snapshot is 94%. Taiwan's time-travel heartbreaker — Alice Ko and Greg Hsu's chemistry and a puzzle-box script earned critics' praise for emotional precision even when the sci-fi mechanics strained credulity. See the full breakdown on the Someday or One Day series page.

**Is Someday or One Day on Netflix?**
No — Someday or One Day is not on Netflix. It streams on Viki, and on Celluloid it is catalogued under Viki. Streaming rights rotate by country, so confirm in your region before subscribing.

**Is Someday or One Day on Viki?**
Yes — Someday or One Day is available on Viki in many regions (catalogued under Viki on Celluloid). Rights differ by country; confirm in the Viki app or the where-to-watch notes.

**What year did Someday or One Day come out?**
Someday or One Day first aired in 2019 and ran through 2020 (2019–2020). Created by Huang Hsiu-chuan; it streams on Viki today.

**How many seasons of Someday or One Day are there?**
Someday or One Day has 1 season across 13 episodes (2019–2020). Status: ended / complete.

**How long does it take to watch Someday or One Day?**
At roughly 40–50 minutes per episode, Someday or One Day’s 13 episodes take roughly 10 hours of runtime (plus credits). Binge pace depends on season breaks.

**Where can I watch Someday or One Day?**
Someday or One Day streams on Viki in supported regions. On Celluloid it is catalogued under Viki. Rights rotate — confirm in your country on the platform app.

**Who is in the cast of Someday or One Day?**
Someday or One Day stars Alice Ko, Greg Hsu, Patrick Shih, Liu Guan-yu. Created by Huang Hsiu-chuan.

**How many episodes are in Someday or One Day?**
Someday or One Day has 13 episodes across 1 season (2019–2020).

**What is Someday or One Day about?**
In 2019, a woman mourning her lost love receives a cassette player that transports her consciousness into 1998 — where she inhabits the body of a teenager and meets the boy who will become the man she lost. Huang Hsiu-chuan's time-travel romance mystery became a pan-Asian obsession.

**Who created Someday or One Day?**
Someday or One Day was created by Huang Hsiu-chuan. It is a romance, drama, sci-fi series from Taiwan, primarily in Mandarin.

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Reviewed and scored by Celluloid · Editor: Kaiser Khan (https://celluloidscore.com/author/kaiser-khan/)

Markdown mirror: https://celluloidscore.com/shows/someday-or-one-day.md