The series "High&Low" is a drama that aired in Japan and was later broadcast in other countries. It explores themes of friendship, loyalty, and the struggles of youth, set in the world of biker gangs.
"High and Low" could refer to several different series or films. One well-known example is "High&Low" (2016), a Japanese television series based on the 1963 film "High and Low" by Akira Kurosawa. If this is the series you're referring to, I can try to provide more general information.