Ke Lin died of cancer in his previous life, and Ji Tong committed suicide because he could not accept Ke Lin's death. The two met again in the underworld. Due to an accident, they were forced to stay in the underworld to replace the judge who fell in love and eloped.
Ke Lin: "Why are you down here? Didn't I tell you to live well?"
Ji Tong: "Um, do you believe me when I say I died suddenly?"
Ke Lin: "I believe you are a ghost?"
Ji Tong: "Aren't we just ghosts now?"
Purpose: mutual growth