Dr. Maito is conducting a standard operation on a patient to retrieve a sample of kidney tissue for biopsy. During the operation, he discovers the initials 'AS' laser-scarred onto the kidney. Referring to the patient's medical records, he discovers the patient had previously undergone a kidney transplant surgery under their close friend and colleague Dr. Aireen Shli, who had used a laser to permanently scar their initials on the patient's kidney out of pride for their exceptional surgical work. The scar cannot be removed, does not affect the patient's health in any way, and will definitely not be discovered by anyone else after Dr. Maito's operation.