He was cold and did not intend to fall in love again after being hurt once. And she was just a brother-obsessed man who was also a single-celled creature when it came to feelings. However, when the relationship heated up, he actually jokingly told her that he would climb the wall, which made her furious. It was originally a joke, but unexpectedly it gradually became a reality... When someone other than her became pregnant with his child, what should she do?