Detective Lu Yan and forensic doctor Shen Xin are tacit partners and fateful enemies. In an accident, the two souls were forced to exchange. However, before they could find a way to exchange it, Shen Xin (carrying Lu Yan's soul) died in the mission.
The whole world is mourning the death of "Shen Xin", but the real Shen Xin is forever imprisoned in Lu Yan's body. He was unable to speak or mourn. He could only live in a strange world with the face of his lover. Every mirror reflected Lu Yan's familiar smile, reminding him of everything he had lost.
The world became the long suicide note left by Lu Yan; and he became the last relic of Lu Yan's existence in the world. Amid the chirping of cicadas in midsummer, he faced his reflection in the mirror and said over and over again the words of love that never received a response.
Concept: Love is the voluntary choice of protection after recognizing each other's essence; and the ultimate protection is to reconstruct the meaning of existence through sacrifice.