“I heard you’re really good at sex.” That’s what Jinyoung’s friends call him — the so-called “Sex Professor.” But in reality, Jinyoung is completely inexperienced and painfully single.
When his 20-year-old sister, Bom, starts questioning him about intimacy, Jinyoung lies and pretends to be experienced. From that moment on, everything changes — Bom begins sneaking into his room every night without their parents knowing. Now, Jinyoung finds himself trapped in a dangerous and forbidden situation that could destroy everything.
A Secret Lesson With My Younger Sister Manhwa, also known as 여동생이랑 비밀 레슨, is an ongoing Korean webtoon released in 2024. The series is written and illustrated by ALIEN. This manhwa belongs to the Drama, Mature, and Romance genres.
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