Recently, a video of Zhang Ruo Nan appeared on social media with a clearly thin figure. In the video, she wore a simple outfit, wearing white socks and a gray dress. What caught the audience's attention was the actress's thin legs.
A part of the audience is worried that Zhang Ruo Nan may be working too much or dieting too much.
But the actress's fans explained that Zhang Ruo Nan tried to lose weight to serve the new film she is participating in.
In the film, Zhang Ruo Nan plays a cancer patient, so she needs to be thin to transform into this character.

This is not the first time the beauty born in 1996 has discussed her appearance. During filming "Khong duoc danh", Zhang Ruo Nan had a scene of sitting in the rain with a wrist so small that she could not wear a watch.
This scene happened in early 2025, when Zhang Ruo Nan's weight dropped to about 37kg. With a height of 1.66m, her BMI is only 14.5. This is a dangerous number, close to the risk threshold for organ failure.
Fragile, vulnerable feeling is the requirement that the director of the film Truong Do set for the character On Di Pham of Zhang Ruo Nan. Therefore, she has applied a strict diet: breakfast is only boiled eggs and celery, lunch is chicken breast mixed with kale, and after noon, she absolutely does not eat anything.
After a night's filming, the assistant saw the actress sitting in the corner chewing vermicelli and eating immediately, with only a nutritional value of 12 calories. The staff revealed that the outfits prepared for Zhang Ruo Nan were actually 12 year old children's size, the dress waist had to be clipped on 7-8 clips to fix them.
This thence has truly become a secret to attracting attention. Her sharp blue skeleton image made the phrase "Chuong Nhuoc Nam thin to heartbreaking" a hot topic, helping her increase 600,000 followers in one day.
However, the price is that she often has hypoglycemia on set. Once, while filming the running scene, Zhang Ruo Nan's eyes were dark and hit the camera, her arms were bruised for half a month without dissolving.
Co-star Bach Kinh Dinh teased Zhang Ruo Nan: "Hopping her like holding a bunch of dried branches, the green rice bone stabs my chin." This line was not in the script, but was the actor's true reaction that was retained in the film.

In the film industry, the saying "increase your weight by 5kg" is spreading. Zhang Ruo Nan's team explained that the camera lens create a vertical stretch effect, the normal body will look fatter on screen.
A film photographer revealed: "The real weight of an artist needs to be lighter on the image of 20%, otherwise it will fail immediately".
This rule forces actresses to fall into a fierce weight loss race. Dinh Nhi lost so much weight that her ribs were exposed, and after 10 days of surgery, she had to return to work and continue dieting. Bai Lu complained in a livestream: "It's obvious that you're very thin, but you still look fat on screen."
However, the new regulation of the General Administration of Radio and Television of China has signaled a change, clearly stating the view against considering "the new thin is beautiful".