Just after my wife and I got married closer to twenty years ago, she became pregnant. At first we were excited as all newly married couples are, but then about seven weeks later the baby stopped developing inside her womb. We were very concerned, especially my wife as you can imagine. We did not know what to do and we wanted to do whatever we could to save the baby. She went to see a specialist for a second opinion and he told her the fetus had stopped developing and that for medical reasons it had to be removed to protect her health and well-being. It was a stark choice: keep the fetus which had stopped developing according to two different Korean OB/Gyn doctors, or abort it and protect her well-being. She was devestated, but she went ahead and had the abortion in an Ob/Gyn clinic. I went in with her and basically held her hand through it all. Even today, years later, my wife feels sad and upset that we lost that baby. Those feelings towards a fetus are very strong within a pregnant mother. So, if you do abort the pregnancy, there is an emotional (and other) costs as well. Physically, the procedure seemed to be pretty safe though a bit uncomfortable et al. She went through all the medical, legal and ethical steps (and then some) before she made a well-informed decision, which she is fine with today though she is, as I said, often sad and grumpy around when what would have been the baby's birthday rolls around on the calendar.
My wife's younger sister, who is Catholic, and her husband who works in the office of a small, rural Catholic church, was pregnant before she and her husband-to-be got married. I never asked specifically what had happened and it was common knowledge that she had become pregnant but they had long before that made plans for getting married. The Korean Catholic Church is very picky about details such as whether or not a Catholic wannabe is really married, or not. A nun came to our apartment and checked that we were really married before my wife was allowed to finish the process of becoming a newbie Catholic. My sister-in-law has since had two other children and she nor her husband do not seem headed to hell in the eyes of their church, because her husband is still working for the Catholic Church and will until retirement.
I doubt you need any advice other than to have a long and serious heart-to-heart/mind talk with your boyfriend, your family and through your boyfriend his family, so you can make the best decision. Don't be afraid to seek counselling and other professional advice, especially if you're thinking of ending the pregnancy. Having children is a big step in Korean life. If you have the baby, your lifestyle will certainly change
All the best to you and all the others who are, or will be involved. Don't be afraid. Now is the time to face up to it and work it out. Others have been in your shoes today and will be in the future. Life happens.