Key art for Boy, with Caution, a 2026 South Korean BL web drama

Boy, with Caution

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SYNOPSIS

Boy, with Caution (Korean: 소년, 주의) is a South Korean boys' love web drama announced for release on 30 September 2026. It has not been released as this entry is written, and everything recorded here comes from the production's own announcements and from Korean press coverage of them rather than from a viewing.

Nakwon Mansion produces and Lee Son-eum directs. The drama goes out on Heavenly, a Korean streaming service that carries boys' love exclusively. Soompi lists a weekly Wednesday slot at 12:00 KST; Sports Kyunghyang gives the release date as the thirtieth. The number of episodes has not been stated in either report, which is common for short-form Korean BL and is one of several gaps this record leaves open rather than fills with a guess.

Ryu Se-il plays Jang Ki-woo, a substitute teacher whom The Movie Database describes as thirty-two, posted to a school where he is not expected to stay and having largely set aside his own ambitions. Ha Jung-hun plays Lee Hyun-jae, twenty-one and repeating a year of high school. The premise as published has each of them recognising something damaged in the other, so that what begins as reluctant supervision turns into an attachment neither is in a position to act on.

Sports Kyunghyang states that the drama is original rather than adapted, which sets it apart from most of the Japanese and Thai boys' love titles arriving in the same season, nearly all of which come from manga or novels.

The teacher-and-student framing is the declared subject rather than an incidental detail, and the eleven-year gap between the two characters is something the publicity foregrounds. How the finished drama handles that is not a question this record can answer in advance, which is why no score is recorded.

CONTENT DETAILS

Native Title
소년, 주의
Original Title
Boy, with Caution
Also Known As
소년, 주의, Sonyeon, Juui
Adaptation
Sports Kyunghyang states that this is an original work and not an adaptation. No web novel, webtoon or manhwa source has been identified for it in any report consulted.
Themes
Key Themes
Teacher And StudentAge GapOriginal ScreenplayKorean BL StreamingRepeating A YearShort-Form Web DramaInstitutional SettingSpecialist PlatformUnreleased ProductionReluctant Supervision
Language
Korean
Seasons
1
Aired Start
Release Year

KEY TAKEAWAYS

  • Announced Date: Scheduled for 30 September 2026 and not released when this record was written.
  • Single-Genre Platform: It goes out on Heavenly, a Korean streaming service dedicated to boys’ love rather than a general-audience broadcaster.
  • Original Work: Sports Kyunghyang states the drama is not an adaptation, unusual among the season’s boys’ love releases.
  • Announced Leads: Ryu Se-il as Jang Ki-woo, a substitute teacher, and Ha Jung-hun as Lee Hyun-jae, a twenty-one-year-old repeating high school.
  • Production Credits: Produced by Nakwon Mansion and directed by Lee Son-eum; no screenwriter has been named.
  • Episode Count Unknown: Neither source consulted states how many episodes there are or how long they run.
  • No Catalogue Overlap: No announced cast or crew member currently holds a profile on this site.
  • No Score Recorded: Nothing has been watched, so no editorial score has been given.

EDITOR’S VERDICT

Reviewed by Renkaze, editor of BL & GL Flix

What the announcement confirms

A release date of 30 September 2026 on Heavenly, Nakwon Mansion as production company, Lee Son-eum directing, and two leads: Ryu Se-il as Jang Ki-woo and Ha Jung-hun as Lee Hyun-jae. Soompi records a Wednesday 12:00 KST slot. Sports Kyunghyang states the drama is original rather than adapted, and describes the pair as a substitute teacher and a twenty-one-year-old repeating high school.

What it does not

No episode count appears in any report consulted, and no running time, so the total length of the work is unknown. There is no screenwriter credit, no content rating, and no statement of whether Heavenly's release is available outside Korea. Supporting cast has not been announced. The romanisation of the lead character's name also varies between sources, appearing as Jang Ki-woo in Korean press and as Jang Gi U on The Movie Database; this record uses the former.

What would change this record

Release. An episode count and a running time follow within a day of the first upload, and a content rating usually with them. The larger open question is one no announcement can settle. A teacher-and-student romance with an eleven-year age gap is the premise the publicity leads on, and whether the drama treats that as a problem to examine or a frame to enjoy is exactly the sort of judgement that requires watching it. No score is recorded here for that reason.

FREQUENTLY ASKED QUESTIONS

When does it start?

30 September 2026. Soompi places it in a Wednesday slot at 12:00 Korean time, and Sports Kyunghyang gives the thirtieth as the release date.

Where can it be watched?

On Heavenly, a Korean streaming platform that carries boys' love exclusively. Whether the release is geographically restricted has not been stated.

Is it a sequel?

No. It is a standalone drama with no earlier season and no connection to another title in this catalogue.

Is this based on something?

No. Sports Kyunghyang reports it as an original work, which makes it unusual among the boys' love titles arriving in autumn 2026, most of which are manga or novel adaptations.

How many episodes is it?

Not announced. Neither of the reports consulted gives an episode count or a running time, so this record leaves both blank rather than estimating from what similar productions have done.

How firm are the details recorded here?

As firm as two press reports allow, and no firmer, since nothing has been released yet. Episode counts, running times, content ratings and reviews are all taken from the finished work on this site, and writing them in advance would turn a catalogue entry into a prediction.

Nothing in this entry describes a released work: dates, platforms and casting announced ahead of a production’s début are frequently revised. Our site disclaimer explains how this catalogue handles corrections.

What Boy, with Caution is about

A streaming service that carries one genre and nothing else changes what a production has to do in order to get made. Heavenly exists to distribute Korean boys' love. A drama commissioned for it does not have to justify itself to a general-audience programmer, compete for a slot against a crime procedural, or soften its premise to survive a standards meeting. It has to satisfy an audience that arrived already looking for exactly this.

The trade shows up in the shape of the category. Budgets on a subscriber-funded single-genre platform are small, runs are short, and episode counts often go unannounced until close to release, which is precisely why this record cannot state one. What the arrangement buys instead is subject matter. A teacher-and-student story with an eleven-year gap is difficult to place on Korean terrestrial television and unremarkable on a service built for this audience.

Korea arrived at that position by a different route from its neighbours. Thai boys' love grew up inside mainstream broadcasters and kept their scale and their advertising money. Japanese boys' love sits mostly in late-night terrestrial slots tied to publishers. Korea's has concentrated instead in small specialist streamers and short-form web releases, with the major broadcasters largely absent. A catalogue record for a Korean title therefore tends to carry a platform name many readers will not recognise, in place of a channel they would.

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