This is a memory that Lin has always wanted to forget, and it is also a secret that belongs to him alone. Ever since he persistently left the home that was filled with the pain of their youth, this secret has been full of thorns and blood. So no matter how kind Hen was to him, or even endured his gloominess and unreasonable temper from time to time, it was not enough for him to start a new life calmly. Because Lin feels that he is Hen's only connection to the past, and he loves Hen, so he needs to use his heart to protect this girl, but if he really does this, he will inevitably cause endless harm to Hen because of the past. He has lost the direction of how to love... His temper is getting weirder and weirder, and his life with Hen has become more and more blunt. It seems that the laughter, intimacy and vows of eternal love in the past have become a thing of the past, so-called unbearable to look back.
In order to maintain the lives of two people in a foreign country, Hen has to squeeze into the crowded subway every day, cross half of the city, and work in a somewhat exclusive job. It was helpless, but she had no choice. But her boss, a very outstanding man named Sen, said that he wanted to pursue her. In fact, Sen has been pursuing her very carefully and actively. But she was unmoved because she already had a man to whom she had taken refuge. Sen, who has a successful career, will not give up easily. He does not force himself. He always fights for the woman he likes with passion, sincerity and meticulousness.
On Valentine's Day, Lin knew about Sen's existence. He didn't say anything, let alone get excited or angry. This made Hen nervous. In fact, Hen had to be nervous - because on Valentine's Day night, Lin went outside alone...