"You mean, you fall for someone with mental illness?" . . . Mark Lee had never expected to open his door one night to a crying stranger, quivering under the rain shower. He had never expected that since the night he took the other in, he would deal with 7 different lives in one body. Mark Lee's life had always been a combination of books and his consultation room. Na Jaemin taught him that there are something else out of the box and the damned four walls.