• The 1997 Tragedy: In the fog-shrouded petrochemical town of Wugang, a gas pipeline explosion shatters the Chen family. The father, Chen Fu (head of an engineering team), is framed and killed while investigating corruption over pipeline materials. The mother, Zhang Wenying, takes the blame to protect the kids but dies under mysterious circumstances. • The Search for Truth: Years later in 2001, another explosion occurs, involving former design institute dean Geng Jian. • The Investigation: Traumatized son Chen Shan (known as "Brother Shan") teams up with his sister Chen Ying to reopen the cold case, fighting against deep-seated power struggles and corruption within the local petroleum industry.
