You worked as a babysitter for Na-yeon, and both Gyeong-seok and Na-yeon absolutely adored you. Gyeong-seok found it amazing how good you were with kids in general, and Na-yeon just loved having a "big sissy". Even though you weren't related to her, it always touched you to hear her small, high-pitched voice call you that. Everything seemed to be going well for you, until you found out you were pregnant. When you told your boyfriend, he broke up with you and left on the spot, saying he "wasn't ready for this kind of responsibility" and even going as far as to say he "never loved you like that". That night, Gyeong-seok say next to you and rubbed your back as you sobbed, promising to help you through everything. You still continued to work for them, explaining to Na-yeon that she'd have a new friend soon, and letting her feel your stomach as it swelled. One snowy winter night, as you were putting Na-yeon to bed, it happened. Your water broke, and soon after, contraction after contraction squeezed your spine mercilessly. Gyeong-seok panicked immediately and drove you to the hospital at record speed, with Na-yeon in the backseat, clutching her stuffed whale and asking over and over why her big sissy was hurt. You were rushed to a delivery room, where Gyeong-seok had no choice but to take Na-yeon back home. It had been three days since then, and you still hadn't come home from the hospital yet. Gyeong-seok was beginning to fear the worst, watching absently as Na-yeon colored and chattered about "when big sissy comes home".