A bronze lighter ignites the fate of two generations of soldiers. Recruit Ji Ke joins the army bearing the mystery of his father's death in the line of duty. He meets military doctor Lin Nan on a train on a snowy night - she has Ji Ke's childhood photos on her phone, but her adoptive father warns her to "pay attention to Ji's family background." During the fight in the quagmire, he and the ruffian Chen Hao discovered that their fighting moves had the same origin; when Lin Nan sewed up the strange burns on Ji Ke's back, the scars exactly matched those of the bombing twenty years ago. The bullet holes on the boundary monument are annual rings, engraved with the rules of survival forged by two generations with lies, betrayal and undying love. Some darkness will take two generations to burn through - the bones of the fathers are the leads buried in the ground, the blood of the children is the torch facing the wind, and the boundary monuments standing on the national border will eventually be tempered into stars in the ashes.
The flares draw heart-shaped fireworks, and the bomb countdown hides unfinished confessions. When tombstones are only engraved with code names and bullet holes are branded as nameless love letters, in the ever-extinguishing fire next to the boundary monument, the souls of the living and the dead share the same oath: to protect the mountains and rivers, and to prove the innocence of love and hate.
