The funeral scene represents the possible ending if Yoohan dies after his revenge. The girl crying represents Jay who - as she also says - met Yoohan at the company, wanted to get close to him, and eventually wanted to become the reason for Yoohan to continue living. And if Yoohan would have died, that would have made Jay very very sad.
The ending of the movie is so touching.
The funeral scene represents the possible ending if Yoohan dies after his revenge.
The girl crying represents Jay who - as she also says - met Yoohan at the company, wanted to get close to him, and eventually wanted to become the reason for Yoohan to continue living.
And if Yoohan would have died, that would have made Jay very very sad.
This is perfection.