The heroine changed from a smiling scientific research girl to a cold-blooded academic master. An accident took away her light. For seven years, she hid her heart in experimental data, until he approached with just the right amount of tenderness, neither urging nor forcing, but just guarding silently.
An unexpected separation caused the two to miss their entire youth, and they were forced to get along after working together for many years. The male protagonist looks cold and strong, but in fact he is affectionate and dedicated. He silently tolerates and protects the female protagonist. He slowly explores the truth of the past and regains the lost love.