Mo's father, Pastor Li Shing-Lam, and his mother landed in Hong Kong from Toronto on flight CX829 at 5.40am on Sunday. The duo were escorted by airline staff and medical personnel when leaving the airport at 7.15am, and took a seven-seat car to their quarantine hotel.

A source said that Mo's parents undergo another nucleic acid test after checking into the hotel and with negative results, they were exempted from quarantine under the authorities' arrangement and went to the hospital to visit their son.

They were reported to have met with the hospital's intensive care unit, neurosurgery department, and spine specialist.

It is understood that the 27-year-old suffered from cerebral hemorrhage and burst fracture at his fourth and fifth cervical vertebrae. He could be paralyzed from his neck down in the worst-case scenario.

Mo was now classified in critical condition under the intensive care of Queen Elizabeth Hospital.

Media were seen waiting outside Mo's ward for the latest news. The case was referred to the West Kowloon Regional Crime Unit for follow-up and will be investigated in conjunction with various government departments to determine if human negligence was involved. There were also police officers stationed outside the ward.

Queen Elizabeth Hospital said on Saturday afternoon that Mo is now staying in the intensive care unit after finishing his second surgery. The hospital further explained that Mo is classified in critical condition because of intubation and the use of anesthesia during surgery. His vital signs are now at steady levels.

Mo is the boyfriend of So Ching” Natalie So, a member of the girl group Collar. The other injured Cheung Tsz-fung (29) suffered a forehead injury and was discharged from the hospital after medical treatment.