A kindly old man famous for his medical clinic in downtown Dublin.
Dr. Lan Di was a Chinese immigrant who moved to Ireland to practice medicine. Though his clinic is small, it is well known due to the good doctor’s marvelous medical skills. In reality, Dr. Di is Tycho in disguise, using him as an alter ego.
After Tycho’s death and return, he felt the need to retire Dr. Di’s persona in order to avoid suspicion about the similar times of the disappearance of both Tycho and Dr. Di. In Tycho’s fiction, Dr. Di passes away from an incurable disease he had been fighting for years.