"If You Are the One" Why did Sang Wu finally cry while driving?

At the end of the play, Sang Wu cried, because Roy's last sentence also touched Sang Wu.

The age in Sang Wu, especially the vicissitudes he experienced; How can there be no shortage of real heart-to-heart friends? Sang Wu "married" to Hokkaido alone, so he didn't understand the loneliness in Roi's mouth. Everyone has their own things to do in their life, but they live far apart, and I don't know when we will meet again. Thinking of this, Sang Wu sang a song and left tears.

Extended data:

movie plot

The genius of the returnee Roi (Ge You) invented the "divergent terminal", which was bought by venture capitalists at a high price of 2 million pounds because it could solve human differences fairly and peacefully. Roi also began to set foot on the road of online marriage, joking all the way. Either he met gay friends again, or he met a salesman. Roi is so disheartened that when she meets a cold woman, Liang Xiaoxiao (Shu Qi), she comes straight to the point and asks the other party to explain her purpose.

This time, it is even harder. I fell in love with a married man with a smile and struggled in The Loved. This time, I only came out to see Qin Fen because of my family's arrangement. The two people who never want to see each other again enthusiastically shared the biggest secret of their lives.

Soon, however, Xiaoxiao, who was ready to break up with her old love, found Roi and said that she would marry him, but she had to go to Hokkaido with him first. Because her love with her old love began there, and now she wants to end there. Roi agrees. When they set foot on a trip to Hokkaido, Roi's old friends in Hokkaido treated them warmly, and the three of them traveled all over Hokkaido. Roi knows that he can't get a smile, but he doesn't know that the knot in the smile is rushing to the bottom of the sea.