What happened to Sister Jing Zhang in the sun?

Sister Qing died in the sun. According to relevant public information, the film Under the Sun tells the story of 1999 in a small town in the northeast from the perspective of girl Guxi. Gu Xi is about to lose his job because he has no registered permanent residence, and his brother Gu Liang, who lives alone, has to stop working because of the oil spill at sea. When my brother and girlfriend Changqing appeared, their relationship became dangerous and ambiguous with the sudden drop of temperature. Qing Changjie died because her sister was jealous of him. The murder case of a floating corpse at sea and the criminal truth revealed by a mysterious tape made Gu Xi wander around the edge of the world of youth and adults and grow rapidly, so he died in the sun.