The Big Bang Theory is a long-running TV sitcom starring a quartet of brilliant but awkward 20-something scientists who gradually grow up and mature over the course of 12 years or so. Leonard, Sheldon, Raj and Howard may be obnoxious and even antagonistic at times, but deep down, they and their friends are all sympathetic people who have been through a lot. In their most vulnerable moments, these characters are easy to like and relate to.
Source：https://www.cbr.com/the-big-bang-theory-most-sympathetic-characters/
