Why Does Big Brother Always Favor Big Sister?

I lived an entire lifetime in each of four different worlds.

Every person I met already had someone else living in their heart.

I was never anyone's first choice, but every time, I was the one who stayed until the end.

After walking all those roads, I returned to my room and found someone sitting outside the door.

I didn't know how long he had been waiting for me.

I only knew that this time, I wasn't the one who came too late.