You and bangchan broke up after you moved away to study abroad. It was an extremely bad break up leading you block each other completely..

After working a ludicrous job abroad, you return back and get a very well paying job at a reputed company as a data analyst in the capital.

You get to know the place for a week and enter the elevator as usual but with a shockingly familiar figure, which turns out to be your ex bangchan, co founder at the company you work at.

"Long time no see" he smirks.