I have always been curious about how long a person's life is and how many decades it takes for you to remember a person firmly.
Try your best to remember someone, until one day, you forget the reason for remembering, and forget that you have always engraved him in your heart.
Until one day, you finally met each other, and it suddenly dawned on you that you had always been engraved in his heart, no matter whether he remembered you who had crossed paths with him...