Li Songjin's mentally ill younger brother has been released from the hospital.
He ran away in the middle of the night and got into an accident, losing his memory. Now she's been forced to look after this little maniac with murderous tendencies.
Song Yunzhou was the younger brother her parents had inexplicably brought home. He was eccentric, his background a mystery. Two years ago, he suddenly went mad and set the house on fire. Her parents nearly died in the blaze, while Li Songjin, who was often away from home, narrowly escaped.
Afterward, Li Songjin personally sent Song Yunzhou to a psychiatric hospital, where he was confined for two years.
The terrifying image of him glaring at her with cold, venomous eyes, as if he wanted to devour her alive, remained vivid in her memory.
But Song Yunzhou, who had forgotten all of it, seemed no longer mentally ill.
He was gentle and obedient, a soft-hearted crybaby who couldn't stop his tears.
He volunteered to take care of all the household chores, loved clinging to her and acting cute with his pretty face, and did everything Li Songjin said, always considerate and attentive.
Their roles in looking after each other had almost completely reversed.
Except for Song Yunzhou's increasingly strange possessiveness toward her.
He constantly checked up on her, forbade her from coming home late, demanded that she report where she was going, and grew clingy and difficult... Whenever Li Songjin let her guard down, he would tearfully reflect on his behavior, leaving her racked with guilt.
Later, when Li Songjin brought her boyfriend home, Song Yunzhou was friendly and kind on the surface. That very night, he went mad, smashed things, and cried until his face was drenched in tears as he begged her to break up. He held her down, rubbing and biting her like a dog, his mind nearly deranged.
Afterward, when Li Songjin flew into a rage, he explained pitifully, "I was just afraid you'd abandon me again, Big Sis. I was so scared."
-
Li Songjin was struggling to handle her younger brother's increasingly intense and bizarre feelings for her.
Fortunately, her parents told her that Song Yunzhou's ultra-wealthy father, who lived in Europe, wanted to claim him as his son and send him to an Ivy League school for a joint program.
Li Songjin immediately spoke kindly to Song Yunzhou, promising she would visit him often. Then she secretly found a job far away, preparing for them to go their separate ways.
Everything went smoothly.
Until the night before he was supposed to leave. Li Songjin prepared a lavish meal to see Song Yunzhou off and congratulate him on returning to his family and having a bright future ahead.
Song Yunzhou also smiled and thanked her for taking care of him all this time.
When Li Songjin opened her eyes after a night's sleep, she hadn't arrived at a farewell.
Instead, she found herself handcuffed to the bedpost, unable to move.
The locked door swung open. Song Yunzhou walked in with breakfast as if nothing were wrong, his tender gaze falling on Li Songjin's terrified, distraught face. He no longer pretended to be obedient or played the victim.
"Why are you abandoning me this time? Was I not good enough? Wasn't I obedient enough?"
The corner of his lips curled as he lowered his hand to gently caress her cheek. His beautiful smile twisted into something eerie. "I've already given up so many ways of getting revenge on you, Big Sis."
"But you're still so awful, so unwilling to change. Is it because you haven't been punished?"
* Blurb concept drafted on June 2, 2025, and revised on June 21.
* Independent, clear-headed older sister x sinister, scheming yandere younger brother
Theme: Do good and accumulate virtue