Park, 30, is accused of stabbing his psychiatrist, Lim Se-won, to death during a therapy session at Kangbuk Samsung Hospital in western Seoul last Monday.

He was arrested immediately, and the police have questioned him to figure out his exact motive.

Park has largely remained silent except for saying that there is "a bomb" in his head and that, when he told Lim about it, the psychiatrist called security instead of helping him get rid of it, according to the police.

The police said Park was consulting Lim to treat his bipolar disorder and dissociation symptoms, citing his past medical records.

Still, the police believe it was a premeditated murder as Park had carried the weapon on him before he came to the session. The suspect apparently wielded the weapon at Lim's chest multiple times. Lim died within hours.

Lim's death has spurred calls for better protection of medical staff in general hospitals and tougher punishment for those who verbally or physically harass doctors and nurses. (Yonhap)