The philosopher Biggie Smalls once pondered the nature of dangerously escalating rivalries. In a song of the same name, Biggie asked, “What’s beef?” Beef Cast: Oscar Isaac, Carey Mulligan, Charles Melton, Cailee Spaeny, Youn Yuh-jung Creator: Lee Sung Jin His answers included the straightforward “Beef is when you need two gats to go to sleep,” and the playful “Beef is when I see you, guaranteed to...