beta
In Hyundo's case, it is easier to move on cuz his ex treated him like shit.
For Yumin, it's harder to move on cuz her ez treated her well and did cherish her( not the way she did but he cared for her like family). That's why I get why she can't forget him easily.
But also this is exactly why Yumin suffered from greater betrayal. Hyundo's ex was just a bad human being toying with him and didn't even try to hide her selfishness and character. He always knew about her but kept enduring it until he reached a breaking point.
Bur for Yumin, it was so sudden. A man she was love in for years reciprocated her feelings and was even planning on getting married. Suddenly she found out he was not sincere.
He never abused her or treated her badly. Just didn't reciprocate her feelings and wasted her time. Its still bad but I get why its hard for her