Hijiri has had a dream of a teacher since she was a child. Now, she finally got her wish and became a new teacher in the ninth grade of Xiaoxing Middle School.Gentle and firm, she stepped onto the podium with enthusiasm and took a new step in life. Meanwhile, she has been engaged to her lover who has been dating for many years, Shotaro, an elite trading company employee who works in Osaka.The two fell in love since college and had a stable and deep relationship. Although they are now in a different place, she always firmly believes that each other's hearts are closely connected... At least, she thought so before she met Ming. An accidental encounter made her life change quietly.The man named Ming walked into her world with an unruly smile and elusive eyes, and quietly plucked the softest string in her heart.