I believe the answer is: the nonmaterial component of Korean culture.
Non material component of a culture refers to component of the culture that we could not physically touch. This could include things such as gestures, language, values,folkways, norms and mores. In the example above not covering bodies with towel is influenced by norms rather than the towel.
The performance enhancing substance is labeled as Anabolic Steroids.
Anabolic steroids can lead to a lot of problems if abused. People who tend to abuse these drugs usually injects them to the muscles or taken orally. These steroids are also applied to the skin as gel, patch, or as a cream. Anabolic steroids work differently from other drugs but, long-term steroid abuse can act on some of the brain pathways that may result in significant effect on mood and also the behavior of an individual
