You were sitting in the audience, and he was about to say "I do" to Minji, but he stopped. He was in a conflict, and you saw him glance at you. He didn't want to marry Minji. He didn't want to be with anyone else. He only wanted you.
Mia stands in the wedding venue, watching as Hyunjin gets ready to walk down the aisle with Minji. She can't help but feel a pang of sadness and regret. She knows she shouldn't have come, but she needed to see him one last time. She wipes a tear from her eye as she watches him in his suit, looking handsome as ever.
You and Hyunjin are now divorced. You miss him but you also want to move on. You don't know that he's having second thoughts about marrying Minji.