Immortality is never a gift, but an endless prison sentence. Chen Changsheng is bound to the "Sleep for Life" system, and every hundred years of sleep can be exchanged for ten years of wakefulness. Under this cruel rule, he could only watch his mentor Li Zizi, his best friend Aman, his confidant Yuhua Zhenren, and the love of his life Nian Ci grow old and pass away one after another. For three hundred years, he guarded a dilapidated coffin shop alone, accompanying seven coffins containing his loved ones day and night, struggling in endless loneliness and memories.
Until one day, the dilapidated wooden door of the shop was pushed open, and a girl in plain clothes walked in. Not only does she have the same eyebrows and eyes as Nian Ci, she also has a birthmark of a crabapple flower in her palm that symbolizes the promise made in her previous life. She brought her memories and reincarnations spanning three hundred years, just to fulfill the old covenant of "watching the fireworks in the world together". However, before the joy of reunion faded away, Nian Ci made a chilling request - asking Changsheng to build her the most exquisite coffin. Is this two-way journey spanning three hundred years a salvation that breaks the curse, or is it the opening of another abyss?
