Winter Sonata S01 E09 Episode 9

"We always come back to our first love"

Yoojin tells Sanghyeok that she cannot marry him, and at the same time, she assures Minhyeong that she cannot have a relationship with him. She begs Sanghyeok to give her a chance to stand on her own. Sanghyeok does everything he can to change her mind, while stepping up to Minhyeong and warning him to not shake her heart.