ID chinese song

hello im new

im from indonesia

my name is monika

can i ask somethi ng? about chnes or mandarine old song? i looking for some mandarin or chines sold song but im forget the title

i just remember what the story of the video

the story of the view is a couple a man an girl who willing toget married

but.. somehow the girl is sick and must go to hospital

and doctor say the girl cannot be cured

so the man go to church and pray for the girl

the girl can be cure but. in exchange the man must turn into butterfly

after discharger from hospital

the girl looking the man who she love

but its gone

she only found a butterfly that always with her all the time

until someday a girl find a another man a god married.

and boy who turn into butter fly go leave the girl with all sadness