This word is a
short form of ‘always haedeun’
‘Deun’ has the meaning of ‘inside’ and it can used when you
love something or someone (korean expression)
Put in simple, alwaysdeun
=
I will always in you
I will always love you,
I will shine you with my sunshine
(‘hae’ is
sun. / haeduen : sun is in it or full of sunshine)
I alwaysdeun.