Who has never been confused in youth? No matter how bumpy the journey is, he will never give up chasing the happiness he wants. He has a past with her. She lost him because of her distrust and stupidity. He and she have forgotten each other since then. Fortune can play tricks on people. He and she meet again by chance after they are separated. When she discovers her mistake and wants to pursue him again, in the two extreme situations of supporting and persuading her to forget, will she bravely pursue and find love or will she forget him in time? But we all know that it is not easy to forget someone, not to mention that he is the source of water that irrigated her when she first fell in love. He is the most intoxicating and saddest first love that she must go through on the road to youth...