Kim Seul-ki returns with a lonely character in the upcoming MBC drama “Protector.”The actress, who has played roles ranging from a high school student to a ghost, will now turn into a character named Seo Bo-mi, a “hikikomori” woman in the show. The Japanese term refers to people who choose to withdraw from social life. In a still that the drama production team released Wednesday, Kim is dressed in an oversized pink hoodie. She holds onto a doorknob and peeks outside from behind a door. Seo watches various places in Korea through surveillance cameras.The first episode of “Protector” is set to air May 22.By Park Ju-young ()