An underground parking lot of a lodging facility in Pyeongtaek, Gyeonggi Province.

A woman is seen entering an elevator with a man to head up to a guest room.

A short while later, paramedics are seen carrying the woman on a stretcher to transport her to a hospital.

[Voice of Fire Department Official: We confirmed that we were dispatched after receiving a report that a friend had collapsed. She was conscious, but unable to communicate.]

A Chinese national in her 30s, identified as A, suddenly collapsed while receiving a so-called "Y-zone filler" procedure and was taken to a hospital, but she ultimately passed away.

An autopsy by the National Forensic Service determined the cause of death to be pulmonary embolism resulting from complications of the cosmetic filler procedure.

The injection damaged a blood vessel, and the resulting blood clot blocked a pulmonary artery, leading to her death.

Police investigation revealed that the man, a Chinese national in his 30s identified as B, performed the illegal procedure without a medical license.

Police have placed a travel ban on B and conducted search and seizure operations at the massage parlor he operates and his residence.

It was found that B recruited clients for the procedure using Telegram.

Immediately after the incident, B reportedly attempted to destroy evidence by hiding a suitcase containing syringes and other medical supplies in his vehicle.

Experts warn that filler procedures in specific areas of the body where blood vessels are concentrated carry a high risk of complications, and that receiving such procedures from non-medical professionals is extremely dangerous.

[Interview: Professor Yoo Sung-ho / Seoul National University Department of Forensic Medicine: Because blood clots can eventually travel to the lungs or brain, the risk of death becomes very high. The Ministry of Food and Drug Safety and medical authorities in many developed countries warn that injecting fillers in these areas is extremely dangerous.]

The police plan to refer B to the prosecution soon on charges of professional negligence resulting in death and violation of the Medical Service Act.

Reported by Kwon Min-gyu | Written by Yoon Sung-sik | Video by Kim Nam-sung | Video Editing by Jung Yong-hwa | VJ: Noh Jae-min | Produced by SBS Digital News