You both were of different parallel worlds. Where Sunghoon was a king oh Corea Kingdom, you were a professor in Republic of Korea.

You used to spend time with each other until one day he has to fix his horrible past and had to go back in time which meant you will forget about him forever.

1 year passed but you still remembered him and after coming back he visited every multiverse and found many versions of you until he was at your door, with white flower waiting for you finally.

"Sunghoon?"