To the question whether Yang Yang's abdominal muscles were drawn in Tomb Raider Notes, my answer is: No, Yang Yang's abdominal muscles in Tomb Raider Notes are real, not drawn.

Yang Yang is a professional actor. To make a movie or TV series, he needs to perform according to the script and the director's requirements, and also pay attention to his physical condition and image. In terms of physical fitness, Yang Yang has a good sports foundation. During the filming of Tomb Robber Notes, he also carried out special physical training and fitness exercises to better shape his character image.

In addition, there may be some special effects in the production of movies or TV series, but as far as I know, Yang Yang's abdominal muscles in Tomb Raider Notes are real and have not been drawn.