"Heart Signal 4" is a fan novel written by the male lead guest Ma Zijia and the second female guest Hong Chengcheng. The background of the story is the love story of Ma Zijia (codenamed Zijia) and Hong Chengcheng (codenamed Chengzi) who met again after the variety show ended.
Concept: Heartbeat Signal 4 Variety Show Fanfic