A Hundred Billion Key Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

A Hundred Billion Key Summary and Synopsis

The ordinary and not-so-ordinary lives of perfect strangers Thach, Mai and Dung become unexpectedly interlaced in this hilarious and wacky story of chance and new beginnings. Thach is a notoriously successful assassin who becomes an amnesiac after a fateful encounter with Dung, a struggling every day man trying to climb up from the bottom of the barrel. Then there’s Mai, the female taxi driver desperately trying to escape the life of an old maid. Through funny chance encounters, the trio’s lives get tossed upside down, pulling them through a surprising and hysterical journey.

Source: Wikipedia (CC BY-SA 3.0).