Their love blossomed from the moment they laid eyes on each other. The young ones call it either butterflies in the stomach or sparks but I believe it is love at first sight. These two were so inseparable to the point they couldn't breathe without each other. Wrote letters to each other every day for the past few weeks until one day, a man, not just any man, a pretty man oozing charisma from head to toe, steps in their lives that'll turn them upside down. Can Taeyeon win back her husband or will Baek Hyun let that man lure him?