Zhan Ye's Taboo and Affection Cannot Be Hidden

Zhan Nanyuan didn't believe in love at first sight, but he fell in love with his best friend at first sight, and fell in love with Shu Xinyao at second sight. From then on, Shu Xinyao fell in love with her heart. He went crazy for her, and also went away to join the army for her. In order to escape from her own feelings, she also left the city where they met, knew each other, and fell in love. Three years later, a wedding reunited them. What kind of intersection would two people who should not be in love have with each other?