Oh In-yeong cooperated with Yang Choon-ja to set up a plan to pretend she was going to United Kingdom with Cha Myeong-seok so he could leave to UK without hesitation. On the day he was leaving, Oh In-yeong told him that she came to the airport to say farewell. Cha Myeong-seok said he would not leave then. Oh In-yeong told him, "I can't let you sacrifice your career because of me. I'll have to live feeling guilty if it'd happen" and "We'll meet again one day, because I'd have turned into a great woman then as well"
Cha Myeong-seok asked, "How would I be assured?" Oh In-yeong responded, "Because we love each other. Because we love each other, we'll be able to meet again". Cha Myeong-seok gave her a tearful hug and left to UK.
Two years later, Oh In-yeong, who could make a successful comeback, also attended a school to improve herself. She met a special instructor there. He was Cha Myeong-seok, who came to the school to give a lecture as soon as he returned from UK.
To his surprise, Cha Myeong-seok noticed Oh In-yeong among students. He explained Euler's formula again, which he had used to confess his love to her in the past. He then approached Oh In-yeong and asked her if she had found her only love.
A student asked him at the moment, "Professor, did you find one?" Cha Myeong-seok said while he was looking at her, "I've already met one and I'm looking at her now".
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