All dramas around us shows a happy ending with the togetherness of couples .But this drama shows us that not every couple has happy ending and they not always end up together . This dramas literally , teaches us that we should always be happy in the happiness of our love and be happy with the memories that we spend together . This drama by name tells the age of both Na Hee-do and Beak Ye-jin 's age when they had the best moments of their life . It just not only shows the relationship of lovers but also best friends , the friendship of Heedo and Yurim was a very diffrent case from others at first when they were kids they were enemies Heedo become fan of yurim , then after they endup becoming enemies again but after all of that at the last they became the best friends forever . It also shows the real life and efforts of a athelit .