X is for Xia Junsu's "Kanashimi no Yukue" (or the one ballad by Junsu-sama I never seem able to get bored of)

Sadness, please do not weep, even though we can see almost nothing
The memories are by our side, forever and ever
For me, happiness changing is more lonely, than happiness coming to an end

Xia Junsu. (2010). Kanashimi no Yukue (The Whereabouts of Sadness)