Boy, with Caution

Boy, with Caution (Korean: 소년, 주의) is a South Korean boys' love web drama that streams on Heavenly from 30 September 2026.

The story follows Jang Ki-woo, a substitute teacher who gave up his dream of teaching after his past and the rumors that followed it. At the school where he is posted he meets Lee Hyun-jae, a 21-year-old held back a year, whom everyone around him avoids. Each of them is marked by the way other people have treated him, and as the two spend their days in the same school they begin to recognise the wounds in each other.

A device runs through the story: Ki-woo finds comfort in an anonymous chat partner, and the person behind the messages is growing closer to him without his knowing who it is. The audience therefore holds a piece of knowledge that the main character does not, and the drama builds its closeness out of what each man says when he believes he is speaking to a stranger.

Heavenly describes the drama as a story of two people drawn together by what they see in one another. Ryu Se-il plays Jang Ki-woo, and Ha Jung-hun plays Lee Hyun-jae. The series is in Korean, with eight episodes of about twenty-five minutes, and it is an original screenplay, not an adaptation.