They are childhood sweethearts who have been opposite each other for more than ten years. They have been tit-for-tat rivals for more than ten years. They express disdain on their lips but have hidden feelings in their hearts.
The rivalry in youth was a disguise to cover up the heartbeat. After going around and around, it became clear that the two of them had been going in both directions by coincidence during the noisy years.
The idea: childhood friends who have always quarreled, go in both directions with reciprocity, proving that the most lasting love is hidden in years of companionship and awkward tenderness.