Corporal Punishment Teacher is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

The weakest student who receives special night-time self-study from Choi Kang-in, a corporal punishment teacher assigned to Cheoni High School to correct the broken school authority and system. The thrilling countertransference of the weak student and reflection begins.