When Daeho was a child, his parents were killed in a tragic accident. After that, he was taken in by his late father's friend, Mr. Cha and raised with love and care. Now, at the age of 20, Mrs. Cha realizes that Daeho has not been properly taught about growing into a man. He keeps having wet dreams and she feels he needs someone to show him how to ease his urges. She takes it upon herself to show him how it's done... One of the most popular webtoons of all time, "Secret Class" is a harem story like you've never read before!