本剧讲述了在乡下的超市工作，与店长有不伦关系的主人公·捻木深爱的故事。在“毒父母”的教育下，深爱的自我肯定感很低，认为“自己没有任何长处”，即使在施暴的父亲去世后，深爱的母亲也很压抑。深爱爱上了对她温柔体贴、第一次肯定了她的店长。为了心爱的店长，深爱的行动不断升级，最终将店长一家拖入泥潭……

Nejiki Mia is a supermarket clerk who has very low self-esteem. She believes she has nothing to offer because she was raised by a toxic parent. She suffered physical abuse at the hands of her father, and even after his death, she lived with her mother who has a strong suppressive personality. She affirms herself for the first time when she falls in love and has an affair with the store manager where she works, who is someone that treats her kindly. However, he decides to leave her after his wife’s illness worsens, and Nejiki Mia falls into despair. In order to cheer up her beloved store manager, she begins to take extraordinary actions in order to cure his wife’s illness. Her feelings gradually become parasitic, as she progressively gets close to not only the manager’s wife, but also his son.

毒親に育てられたことで、「自分には何の取り柄もない」と思い込んでいる自己肯定感の低いスーパーの店員・捻木深愛（ねじき・みあ）。常に否定し続け、暴力を振るっていた父亡き後も抑圧の強い母と２人で暮らす深愛は、初めて自分を肯定し、優しくしてくれた店長に恋をして、不倫関係に。ところが、店長の妻の病が悪化したことをきっかけに別れを切り出され…。突然、絶望のどん底に突き落とされた深愛ですが、考えた末に導き出した答えは――「私はやっぱり、店長と幸せになりたい」。愛する店長を元気にするために、店長の妻の病気を治そうととんでもない行動に出始め…やがてその行動はどんどんエスカレート！　深愛の純粋すぎる想いが、店長一家を蝕んでいくことに…!!

점장과 불륜 관계인 주인공이 점장의 아들, 그리고 점장의 아내에게까지 다가가 사랑하는 상대 가정에 서서히 기생해 수렁으로 끌고 가는 드라마