电影《年轻母亲3》讲述了二十岁的基灿和他的父亲相依为命的生活。然而有一天，他们家迎来了继母尹瑞秀。尹瑞秀试图与基灿搞好关系，但他却将她视为女性，对她产生了不正当的情感，并开始向她展示这种感情。尹瑞秀强烈拒绝了他，但她也明白自己内心对他的情感难以割舍。他们的关系变得危险而扑朔迷离。直到有一天，一直暗恋着基灿的民婧发现了两人之间发生的事情。年轻的继母愚弄了她的丈夫，与他的儿子陷入了禁忌之爱，而儿子也深深爱上了父亲的妻子。他们与民婧达成了协议，以确保她保守秘密

这部电影深入探讨了禁忌之爱的主题，勾勒出了一个复杂而令人心痛的故事。基灿和尹瑞秀之间的情感纠葛是一种错误的迷恋，是伦理和道德所不能容忍的。然而，他们却陷入了这个道德边缘的漩涡，无法自拔。

在这个家庭中，各自都有着自己的秘密和心事。基灿内心的挣扎和纠结，尹瑞秀的欲拒还迎，以及民婧的无助和心碎，都展现了人性复杂的一面。他们之间的爱恨情仇构成了电影的核心，使得观众在情节中不断地思考道德与欲望的边界。

The movie "Young Mother 3" tells the life of 20-year-old Ki-chan and his father. However, one day, their stepmother Yin Ruixiu was welcomed into their home. Yoon Seo-soo tries to have a relationship with Ki-chan, but instead he sees her as a woman, develops illicit affection for her, and starts showing it to her. Yin Ruixiu strongly rejected him, but she also understood that she couldn't let go of her feelings for him. Their relationship becomes dangerous and confusing. Until one day, Min Jing, who has been secretly in love with Ki Chan, finds out what happened between the two. A young stepmom fools her husband into a forbidden love with his son, who is also deeply in love with his father's wife. They made a deal with Min-jing to make sure she kept it a secret

The film delves into the theme of forbidden love, outlining a complex and heart-wrenching story. The emotional entanglement between Ji Chan and Yin Ruixiu is a false obsession, which cannot be tolerated by ethics and morality. However, they are caught in the vortex of this moral edge and cannot extricate themselves.

In this family, everyone has their own secrets and concerns. Ji Chan's inner struggle and entanglement, Yin Ruixiu's refusal to welcome, and Min Jing's helplessness and heartbreak all show the complicated side of human nature. The love and hatred between them constitute the core of the film, making the audience constantly think about the boundary between morality and desire in the plot.