社团学姊大一新生李毅杰历经千辛万苦，终于加入戏剧电影社 P&M。原本只是想在社团中磨练自己，却意外成为众多学姊与正妹社员的关注焦点。面对她们的积极攻势，毅杰陷入了既甜蜜又充满挑战的校园生活。他能否在这段青春旅程中熬过考验，找到属于自己的真爱呢？
秘密教学由美娜赞&钢铁王创作，讲述子豪在13岁时失去父母，成为孤儿后由父亲的朋友收养。多年后，虽然已经成年，但子豪在与人交往方面依然显得单纯与懵懂。为了帮助他更好地融入社会，阿姨与姊姊们决定给予他生活上秘密的教学。
兄妹的秘密授课故事讲述健铭在朋友间被戏称为“恋爱博士”，但实际上他从未真正谈过恋爱。 某天，妹妹诗怡因误会而向他提出奇怪的问题，健铭一时虚荣心作祟，谎称自己很有经验。没想到，这个谎言却让兄妹之间的关系陷入了尴尬与麻烦之中。 在一连串啼笑皆非的事件中，健铭必须学会面对真实的自己，化解误会，并在成长的过程中找到属于自己的青春答案。
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