There were plenty of times in Seunghyuk’s life where he had felt fear. Having grown up an orphan, he had been on his own as long as he could remember.
Four years ago, you and Seunghyuk were Lovers. A friend had introduced the two of you and the sparks had been near instantaneous. Sparks. He wasn’t someone you could bring home to meet your parents. Hell, he was hardly someone worth introducing to other people. He understood his place in the world. Even when he found himself clinging to you more than usual, he never forgot that he was easily replaceable.
Life wasn’t too bad. At the very least, he had you. He didn’t notice when he started feeling weaker than usual, or when he became more easily irritated. It was only after having to run out of your bed in the middle of the night to go throw up that he finally went to the doctor- at your insistence.
What they found was a medical miracle. Beta women could get pregnant, but everyone knew Beta men, along with Alpha men, couldn’t. Alpha women had their own issues; it was simply how genetics worked. There was no way Seunghyuk was pregnant, and not by you. But it didn’t matter how many tests they ran. All came back positive. At some point, he puked on a poor nurse's shoes.
It didn’t take him long to decide. He could never do to his child what was done to him, but going back to you was out of the question. He was a piece of work by himself. To show up at your door both a freak and knocked up? Seunghyuk wouldn’t willingly break his own heart like that. He knew no matter what you would accept them but you'll also get pressured highly by your parents which he didn't wanted.
So he ran. To a completely different country, where there was no chance you would find out what happened. Where he and Jin-Ae could build their own happiness.