I was googling them to see pictures together and there were multiple denial articles each time the rumor popped up.
Also, he seems like a really private guy so I'm not too surprised there wasn't any hint of this rlshp prior.
He was also acted with Nam Sangmi before in Time Between Dog & Wolf and she just married last year so she probably still single at that time ((probably not hehe).
TBH, I think anyone who watch the drama liked the second girl more than the lead girl.
What I am surprised is why they decided to reveal it now?
Dispatch doesnt just "catch" celebs on dates, they work with management agencies/celebs themselves to reveal details (true or staged) to the public.
It seems with the latest rumor making headlines along with photos from Dispatch, they've decided to go public with their relationship.