The Unsolved Case: The Person in the Cabinet

Twenty years ago, husband Zhong Baotian and wife Huang Xiu trapped their daughter Keke in a basement iron cabinet to hide her from their poverty, then moved the city with their son. Keke suffocated inside. Twenty years later, due to their son Zhong Yang's wedding, a master revealed they still had a missing daughter. The couple returned to their hometown to prepare for burying Keke's remains in the cabinet. However, just as Zhong Baotian prepared to open it, Keke's voice echoed from inside after two decades.