"Bai Lianhua" may also refer to herbs or plants that actually have only white flowers without any function, or refer to a variety of white aquatic plants-lotus.
I. Sources
The word "Bai Lianhua" first appeared in Hokkekyo, an ancient Buddhist classic in China, to describe the lotus in the pure land. Later, the word gradually evolved into a derogatory description of people. Its specific source may be related to some legends in ancient China folk culture, such as "White Lotus Religion" and "Western Religion".
Second, the use of scenarios
On social media, someone posted a touching public service advertisement, but other users pointed out that the user was actually a "Bai Lianhua" and accused him of just showing off his kindness.
In a novel, a female character shows a very gentle and kind appearance, but in fact she secretly frames other characters and pursues her goals by hook or by crook. In the novel, this female character may be described as a "Bai Lianhua".
In social situations, someone met a seemingly friendly and generous stranger, but later found out that this person actually had bad motives. In this case, the stranger may be described as a "Bai Lianhua".