My Possessive Younger Brother Is Pretending to Be Sweet

[Yandere, reborn, younger man, romance, love-cultivating Gu]

Scheming yandere younger brother Xie Jin vs. obsessive older sister Zhuang Yu

Zhuang Yu devotes herself to scientific research in hopes of curing her younger brother, who has ALS. Just as she succeeds, her rival discovers the breakthrough and steals the treatment. Zhuang Yu dies in the flames. Her brother, who has spent years in a wheelchair, unexpectedly stands up…and marries her in a ghost wedding.

Reborn, Xie Jin refuses to let Zhuang Yu remember her past life and tries every method he can think of…drugging her, planting love-cultivating Gu in each other…

What will become of them in the end?