The protagonist and his friend discovered a corpse with a disfigured face. The protagonist and his friend went to investigate the source of the corpse, but the friend was killed. During the investigation alone, the protagonist discovered a space-time rift that allowed him to go back in time, so he kept going back to the past to save his friend, but failed every time. Later, the protagonist discovered that only his own death could protect his friend, so he fell in the space-time rift, and his face was burned by the fire, which is the corpse at the beginning.
Intent: Deep affection and self-sacrifice across time, interpreting the ultimate meaning of redemption, complete science fiction worldview, and positive and complete emotions