Mabel, Liam and Aaron have been friends since childhood. Their bonds of friendship are tested when, years later, they realize their friendship is the only reason they have made it through emotional hardships and extreme tragedies.

On the same day, in the same accident, Wei loses his pregnant wife and Ming her fiancé. In Buddhism, one is given 100 days to mourn for the dead. Like two mice lost in a labyrinth, Wei runs around in circles while Ming calmly creeps down a determined path. But the pain and sorrow linger on. With the 100th day approaching, they wonder if they'll ever be able to say goodbye.

A terminally ill man sets up his best friend, whom he has loved since high school, so that she will not be lonely after he passes away.