John Cho is perhaps best known for playing Sulu in the “Star Trek” reboots and Harold in the “Harold and Kumar” films. His new movie “Searching” takes place entirely on computer screens. We discuss the unique challenges of performing alone in some scenes and trusting director Aneesh Chaganty to navigate him through the space. We also talk about “Columbus” (directed by Kogonada) and the connection he felt with co-star Haley Lu Richardson that truly powers the film.