This is a long urban emotional novel about memory, illness and unfinished love.
When 31-year-old Shen Zhihan was diagnosed with early-stage Alzheimer's disease, he knew that he was forgetting the entire world at an accelerated pace. Before his memory completely faded away, he had only one obsession: to find the woman he loved but had hurt so much and say sorry for being late.
The only clue is an old ring and the lighthouse that appears repeatedly in the dream on rainy nights.
Oncologist Lin Jianqing "accidentally" intervened in his search and accompanied him to trace the memory fragments, but gradually discovered that the "Wanwan" he was looking for was actually his sister who left a foreign country two years ago. The past that Shen Zhihan desperately wants to forget hides a secret fulfilled in lies, an unspoken child, and a protection completed with parting.
At the end of memory, is it deeper forgetfulness or the possibility of falling in love again?