One Minute After I Transmigrated, My Sister Started Backing Me into a Corner

[Handcrafted from Scratch + One Female Lead + Yandere Heroine + Pure Romance, 1v1, Mutual Devotion + Everyday Life + Transmigration + Slow-Burn]

An accident at fifteen cost him his family.

At sixteen, caught in bitter disputes among his relatives, he was sent to a psychiatric hospital.

Years of put-downs and pressure, along with the physical effects of his medication, left his mental state unstable.

That very instability was what allowed him to protect himself.

He fell asleep as usual. When he opened his eyes again, he had transmigrated into someone else's body.

Before he could even make sense of his situation, his younger sister, Chen Qi, closed in on him, throwing him into grave danger.

"I just transmigrated, and I'm already in trouble?"

Afterward, he tried to accept his new identity and live a proper life, sharing his days with Chen Qi.

His mental instability grew more frequent, but each time he came to, he was safe and sound.

He could never understand why he was able to get through each episode without medication.

Then he happened to discover a sealed underground room hidden in the house.

The sight that greeted him when he stepped inside sent a chill down his spine. All he wanted was to get out as quickly as possible.

But as he fled upstairs, a figure stood silently in the doorway.

"Chen... Qi..."

"My dear big brother, so you wanted to live here after all?"