Shen Qingci, an ancient book restorer, accidentally awakens to the "red thread of yin and yang". The red thread on his fingertips can not only draw the unresolved love between the yin and yang worlds, but also cut off the evil ties entangled by the resentful spirits. In the name of Yin Yuan Matchmaker, she walks the boundary between the world and the underworld - helping the souls of the Republic of China deliver unsent love letters, helping obsessive mothers protect their young children, and holding the reincarnation red thread for lovers who have missed this life. Every time a negative relationship is resolved, the red thread will give healing energy to repair the emotional wounds left by the lack of love in her childhood.
Until a commission, she met her first love Gu Yanchen again. In the past, he was forced to break up due to a misunderstanding between his family of origin, but now he is entangled by the ghost of his cousin who had a crush on her. This fate is exactly her obsession that must be solved. During the cooperation, the red thread repeatedly pulled out the dusty memory fragments of the two people. The truth about their breakup and Gu Yanchen's unspoken forbearance and protection gradually emerged.
Yin and earth are intertwined, resentful spirits are at work, and family obstructions follow one after another. Shen Qingci holds the red thread in hand, while resolving the emotional attachment between the yin and yang realms, and at the same time, under the gentle protection of Gu Yanchen, he gradually walks out of the shadow of the past. When the red thread of sin cuts off the bad fate and the red thread of fate ties each other, they will finally understand: the so-called redemption is not only to help the dead souls let go of their obsessions, but also to allow themselves to find their complete selves in loving and being loved.
