When their parents marry, two high school students become stepbrothers and navigate their relationship, turning from enemies into something more special.
The On1y One (2024) is a drama and comedy series that premiered on August 22, 2024, spanning 1 season and 12 episodes. It stars Liu Dongqin, Benjamin Tsang, Samuel Ku and Kenny Yen. Viewers rate it 8.7 out of 10 across 32 ratings.
Watch the official trailer for The On1y One before you start streaming.
Official trailers, teasers, clips and featurettes for The On1y One.
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Liu Dongqin
as Sheng Wang
Benjamin Tsang
as Jiang Tian
Samuel Ku
as Zhao Xi
Kenny Yen
as Lin Bei-ting
Lu Tingyu
as Yang Jing 'Jenny'
Duan Chun-hao
as Sheng Ming-yang
Jennifer Hong
as Jiang Ou
Yu An-shun
as Old Man Ding
Chen Wei-min
as Mr. Zhao
Executive produced by Ken Xu and Liu Kuang-Hui.
Average viewer score of 8.7/10 from 32 ratings.
When ”The On1y One” was announced and it was apparent that it was more or less another adaptation of the first ”Addicted” book, I wondered if the world really needed yet another series about stepbrothers. Well, maybe the world didn't really need this series, but unlike the Thai adaptation of ”Addicted”, which failed in every aspect, this one can compare to the groundbreaking series from mainland China. I would even…
Reviewed on April 6, 2026
This is the story of two guys in their junior year of high school who end up as step-brothers and in time a more serious bond develops between them, which is slowly leading toward romance. A little spoiler ahead. The good, it is a well told story with several subplots and actually they have a straight best friend who adds a lot of humor to the series, I wish they had done more with him. Then there is end of episode…
Reviewed on August 29, 2026
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The On1y One (2024) is available to stream on Rakuten Viki. Availability comes from JustWatch data and varies by country.
The On1y One has 1 season and 12 episodes in total, starting from its premiere on August 22, 2024.
No. The On1y One is marked as ended, with the final episode airing on September 26, 2024.
The On1y One (2024) stars Liu Dongqin, Benjamin Tsang, Samuel Ku, Kenny Yen and Lu Tingyu. The full cast list with character names is available in the cast section of this page.
The On1y One (2024) is rated 8.7 out of 10 from 32 viewer votes, and suits viewers who like drama and comedy series. Reviews from viewers are collected further down this page.
The official The On1y One trailer is embedded in the trailer section of this page and plays instantly in your browser.
