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The plus nine effect
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Series
Plus Nine Boys
아홉수 소년
2014EndedSouth Korea65 min
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What's it about?
This is a romantic comedy series about four boys at the ages of 9, 19, 29 and 39 who each confront different challenges in love and work at the cusp of a new decade in their lives.
Where to stream?
AvailableChecked 09/29/2026 · United States catalog · account required.
Tubi TV
Amasian TV
The Roku Channel
Availability data partly provided by JustWatch via TMDB.
Cast
Kim Young-kwang
김영광
Kang Jin-gu
14 episodes
Oh Jung-se
오정세
Gu Kwang-soo
14 episodes
Yook Sung-jae
육성재
Kang Min-gu
14 episodes
Choi Ro-woon
Kang Dong-gu
14 episodes
Kyung Soo-jin
경수진
Ma Se-young
14 episodes
Yoo Da-in
유다인
Joo Da-in
14 episodes
Park Cho-rong
박초롱
Han Soo-ah / Bong-sook
14 episodes
Lee Chae-mi
Jang Baek-ji
14 episodes
Kim Hyun-joon
김현준
Park Jae-bum
14 episodes
Kim Mi-kyeong
김미경
Gu Bok-ja
14 episodes
10 people — scroll sideways
Crew
Director
Yoo Hak-chan
Writer
Park Yoo-mi
Episodes
Season 1 — 14 episodes · from 08/29/2014
Page 1 of 1 · Episodes 1–14
Suddenly one day
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It has been a while
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When love finds you
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Bad boy
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We are in love with aliens
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September 19th
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Things that make men change
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The girls' stories
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Celebrating you
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I want to tell a Secret
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Lean on me
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Because I love you
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Young man matures into an adult
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Image gallery
Posters (2)
Stills (1)
Images © their respective rights holders · Source: TMDB