Su Wanru, a Chinese living in South Korea, struggles to survive between dreams and reality. She met them. "They" is used because he refers to more than one person. They are big stars who are dazzling and charming on the stage, but they are young people with very different personalities in private.
Lee Donghae, Lee Hyukjae, Kim Jaejoong, Jung Yunho...
I think this is probably a story about youth and dreams.