Cheung Yat Kin (Kenneth Ma) recently graduated and started his practice in neurosurgery at Mercy Hospital (慈愛醫院).

Although his medical interns were afraid of his strict rules and high expectations, they respected his exceptional skills and experiences.

Kin initially studied medicine because he was grateful to the doctor Fan Chi Ngok (Yu's father) who saved his younger brother, Cheung Yat Hong (Nathan Ngai) after a horrible traffic accident.

However, when she found out that her long lost sister, Hung Mei Suet (Mandy Wong), also liked Kin, she decided to give up on pursuing him.

To make matters worse, Kin suddenly finds out that Yu suffers from tumor in her spine which may become life-threatening.